Practice Test

Q1) Which of the following units respresent largest amount of energy ? Show Answer

Q2) Thermodynamic equilibrium involves Show Answer

Q3) In an adiabatic expansion of ideal gas Show Answer

Q4) When one mole of a gas is heated at constant volume, temperature is raised from 298 to 308 K. Heat supplied to gas is 500 J. Then which statement is correct ? Show Answer

Q5) The intensive property among these quantities is Show Answer

Q6) In a closed insulated container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true ? Show Answer

Q7) An adiabatic expansion of an ideal gas always has Show Answer

Q8) Mechanical work is specially important in system that contains Show Answer

Q9) System in which there is no exchange of matter, work or energy from surrounding is Show Answer

Q10) In thermodynamics which one of the following is not an intensive property ? Show Answer

Q11) The final temperature in an adiabatic expansion is Show Answer

Q12) Work done in expanding 10 moles of an ideal gas, isothermally and reversibly from a pressure of 5 atm to 1 atm at 300 K is Show Answer

Q13) One mole of an ideal gas is expanded isothermally and reversibly from an initial pressure of 1.0 bar to a final pressure of 0.1 bar at a constant temperature of 273 K. Which of the following statements is correct regarding this context. ? Show Answer

Q14) A gas can expand from 100 mL to 250 mL under a constant prssure of 2 atm. The work done by gas is Show Answer

Q15) The internal energy change when a system goes from state A to B is 40 kJ/ mole.If the system goes from A to B by a reversible path and returns to state A by an irreversible path what would be the net change in internal energy ? Show Answer

Q16) Identify the state quantity among the following Show Answer

Q17) Which of the following statements is false ? Show Answer

Q18) Two moles of an ideal gas is expanded isothermally and reversibly from 1 L to 10 L at 300 K. The enthalpy change ( in kJ) for the process Show Answer

Q19) In thermodynamics, a process is called reversibly when Show Answer

Q20) Calculate the heat of reaction for the hydrogenation of acetylene if
(i) Heat of formation of water = - 68.3 kcal
(ii) Heat of combustion of acetylene = - 310.6 kcal
(iii) Heat of combustion of ethylene = - 337.2 kcal Show Answer

Q21) Which of the following reaction corresponds to the definition of enthalpy of formation ? Show Answer

Q22) The heat change at constant volume for the decomposition of silver (I) oxide is found to be 30.66 kJ. The heat change at constant pressure will be Show Answer

Q23) In general, for exothermic reactions to be spontaneous Show Answer

Q24) The heat of neutralization is maximum when Show Answer

Q25) Heat of neutralization of a strong acid by a strong base is a constant value because Show Answer

Q26) Heat of combustion is always Show Answer

Q27) Evaporation of water is Show Answer

Q28) An endothermic reaction is one in which Show Answer

Q29) An exothermic reaction is one in which the reacting substances Show Answer

Q30) Heat of neutralisation of strong acid against strong base in constant and is equal to Show Answer

Q31) Hess's law deals with Show Answer

Q32) The law of Lavoisier and Laplace illustrates Show Answer

Q33) Heat capacity is Show Answer

Q34) Variation of heat of reaction with temperature is known as Show Answer

Q35) Compounds with high heat of formation are less stable because Show Answer

Q36) The heat absorbed at constant volume is equal to the system's change in Show Answer

Q37) If a reaction involves only solids and liquids, which of the following is true ? Show Answer

Q38) Enthalpy of an exothermic reaction is always Show Answer

Q39) Heat exchanged in a chemical reaction at constant temperature and pressure is called Show Answer

Q40) In order of decompose 9 g of water, 142.5 kJ of heat is required. Hence enthalpy of formation of water is Show Answer

Q41) Which of the following is not correct ? Show Answer

Q42) Enthalpy of formation HF and HCl is - 161 kJ and - 92 kJ respectively. Which of the following statements is incorrect ? Show Answer

Q43) Heat liberated when 100 mL of 1 N NaOH is neutralised by 300 mL of 1 N HCl. Show Answer

Q44) Hess's law states that Show Answer

Q45) The heat required to raise the emperature of a body by 1 K is called Show Answer

Q46) The enthalpy change for a reaction does not depend upon Show Answer

Q47) Entropy change of the system and the surroundings in equilibrium Show Answer

Q48) Which of the following does not result in an increase in the entropy ? Show Answer

Q49) The unit of entropy is Show Answer

Q50) For a reversible reaction at temperature T, which of the following is correct ? Show Answer

Q51) For an isothermal, reversible expansion of an ideal gas Show Answer

Q52) Which of the following expressions is not correct? Show Answer

Q53) A particular reaction has a negative value for the free energy change. Then at ordinary temperature Show Answer

Q54) Which of the following is not an intensive property? Show Answer

Q55) In a bomb calorimeter, the heat of reaction is measured at Show Answer

Q56) If temperature remains constant during the process, it is called an Show Answer

Q57) The entropy of the universe Show Answer

Q58) Which of the following enthalpies is always negative? Show Answer

Q59) Which of the following has highest entropy? Show Answer

Q60) Entropy change for an adiabatic reversible process is Show Answer

Q61) The temperature of the system decreases in an Show Answer

Q62) The enthalpies of elements in their standard state are taken as zero. Hence the enthalpy of formation of a compound Show Answer

Q63) When potassium chloride is dissolved in water Show Answer

Q64) According to third law of thermodynamics, the entrophy of crystalline substances at absolute zero is taken as Show Answer

Q65) All the naturally occurring processes proceed spontaneously in a direction which leads to Show Answer

Q66) Free energy, G may be defined as Show Answer

Q67) When a solid changes into liquid, the entropy Show Answer

Q68) Entropy is a measure of Show Answer

Q69) When a solid is converted directly into gaseous state , the process is called sublimation. The entropy change during the process is Show Answer

Q70) Which of the following processes is accompanied by decrease in entropy? Show Answer

Q71) A spontaneous change in one in which the system suffers. Show Answer

Q72) If there is no exchange of heat between the system and the surrounding during the process. It is called Show Answer

Q73) An endothermic reaction is allowed to occur very rapidly in the air. The temperature of the surrounding air Show Answer

Q74) Which of the following is not a state function? Show Answer

Q75) Which of the following modes of energy constitutes both kinetic energy and potential energy? Show Answer

Q76) Which of the following gases has the highest heat of combution? Show Answer

Q77) The energy of molecular motion appears in the form of Show Answer

Q78) The enthalpies of formation of organic substances are conveniently determined from Show Answer

Q79) Two objects are said to be in thermal equilibrium if they have same Show Answer

Q80) An isolated system is that system in which Show Answer

Q81) The entropy of a perfect crystalline solid at absolute zero is Show Answer

Q82) The free energy change for a reaction is zero when Show Answer

Q83) The enthalpy of formation of two compounds A and B are -84kJ and -156kJ respectively. Which one of the following statements is correct? Show Answer

Q84) The change in entropy of an ideal gas during a reversible isothermal expansion is Show Answer

Q85) In which case of mixing of a strong acid and a strong base each of 1 M concentration, temperature increase is highest? Show Answer

Q86) Which of the following is not an endothermic reaction? Show Answer

Q87) In an exothermic reaction, the reactants Show Answer

Q88) The variation of heat of reaction with temperature is given by an equation known as
Show Answer

Q89) In an endothermic reaction Show Answer

Q90) An adiabatic process is one in which Show Answer

Q91) Which of the following processes is not accompanied by increase of entropy? Show Answer

Q92) Which of the following conditions is not favourable for the feasibility of a process? Show Answer

Q93) In which of the following cases, the reaction is spontaneous at all temperatures? Show Answer

Q94) In an adiabatic expansion of an ideal gas Show Answer

Q95) Which of the following reaction represents enthalpy of formation of AgCl? Show Answer

Q96) For a reversible process at equilibrium, the change in entropy may be expressed as Show Answer

Q97) Free energy is related to enthalpy and entropy changes as Show Answer

Q98) For an equilibrium state. Show Answer

Q99) Which of the following neutralisation reactions is most exothermic? Show Answer

Q100) Which of the following equations represents standard heat of formation of methane? Show Answer

Q101) The units of entropy are Show Answer

Q102) Which of the following quantities is not a state function? Show Answer

Q103) In an isothermal expansion of an ideal gas Show Answer

Q104) For a spontaneous endothermic reaction Show Answer

Q105) The heat of combustion of yellow phosphorus and red phosphorus are -9.91 kJ and -8.78 kJ respectively. The heat of transition of yellow phosphorus to red phosphorus is Show Answer

Q106) For an ideal gas, the joule Thomson co-efficient is equal to Show Answer

Q107) The entalpies of combustion of some fuels are given below. Which of these has lowest efficiency as fuel per gram? Show Answer

Q108) Which of the following statements / relationships is not correct? Show Answer

Q109) When 1000 ml of a 1M solution of sulphuric acid is neutralised by a strong base in dilute solution. The standard enthalpy of neutralisation is Show Answer

Q110) Which of the following salts will have maximum cooling effect when 0.5 mole of the salt is dissolved in same amount of water. Integral heat of solution at 298 K is given for each salt? Show Answer

Q111) Which of the following properties of a system undergoing change at a constant temperature and pressure is a measure of the maximum useful work that the system can do? Show Answer

Q112) Which of the following values of heat of formation indicates that the product is least stable? Show Answer

Q113) In which of the following neutralisation reaction. the heat of neutralisation will be highest? Show Answer

Q114) For a reaction to be spontaneous at all temperatures Show Answer

Q115) The enthalpy of neutralisation of any strong acid and strong base is nearly equal to Show Answer

Q116) For n moles of an ideal gas Show Answer

Q117) Which of the following expressions is true? Show Answer

Q118) When an ideal gas is suddenly allowed to expand adiabatically into an evacuated container, then Show Answer

Q119) Molar heat capacity of water in equilibrium with ice at constant pressure is Show Answer

Q120) The bond energies of C - C, C = C, H- H and C - H linkages are 350, 600, 400 and 410 kJ per mol respectively. The heat of hydrogenation of ethylene is Show Answer

Q121) Two moles of an ideal gas is expanded isothermally and reversibly from 1 L to 10 L at 300 K. The enthalpy change (in kJ) for the process is Show Answer

Q122) For a reaction to proceed simultaneously. Show Answer

Q123) When 1 mole of a gas is heated at constant volume, temperature is raised from 298K to 308K. Heat supplied to the gas is 500J. Then which statement is correct Show Answer

Q124) If the system does not exchange heat with the surrounding, the process is Show Answer

Q125) Which of the following is an intensive property? Show Answer

Q126) System in which there is no exchange of matter work or energy with the surrounding is Show Answer

Q127) Considering entropy (s) as a thermodynamic parameter, the criterion for the spontaneity of any process is Show Answer

Q128) The enthalpy of a monoatomic gas at T kelvin is Show Answer

Q129) A reaction occurs spontaneously if Show Answer

Q130) Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction? Show Answer

Q131) Which of the following are not state functions?
(I) q + w
(II) q
(III) w
(IV) H - TS Show Answer

Q132) Thermodynamically the most stable from of carbon is Show Answer

Q133) Which of these species has a standard enthalpy of formation equal to zero? Show Answer

Q134) Which one of the following demonstrates a decrease in entropy? Show Answer

Q135) When an ideal gas is allowed to expand adiabatically into an evacuted vessel then Show Answer

Q136) A gas expands from 1.5 L to 6.5 L against a constant pressure of 0.5 atm and during this process, the gas also absorbs 100 J of heat. The change in internal energy is Show Answer

Q137) Which of the following is not true regarding entropy? Show Answer

Q138) the standard enthalpy of combustion of solid boron is equal to Show Answer

Q139) The state of maximum entropy for water is Show Answer

Q140) The net energy change in a reversible cyclic process is Show Answer

Q141) Which of the following set contain only all extensive or intensive properties? Show Answer

Q142) Which of the following statements is false? Show Answer

Q143) In thermodynamics, a process is called reversible when Show Answer

Q144) Which of the following expression is true? Show Answer

Q145) The total entropy change for a system and its surroundings increases, if the process is Show Answer

Q146) For which of the following reaction, the change in enthalpy is equal to change in internal energy? Show Answer

Q147) 4.6 g of iron combines with sulphur evolving 8.27 kJ. The heat of formation of iron sulphide is Show Answer

Q148) Which of the following statement is not correct? Show Answer

Q149) In which of the following, entropy decreases: Show Answer

Q150) All the naturally occurring processes proceed spontaneously in a direction which leads to Show Answer

Q151) In general, for exothermic reactions to be spontaneous Show Answer

Q152) For a reaction to occur spontaneously Show Answer

Q153) For a process to be spontaneous Show Answer

Q154) A reaction is not feasible, if Show Answer

Q155) Identify the correct statement regarding entropy Show Answer

Q156) The law of thermodynamics that provides the basis for the determination of absolute entropy of a substance is Show Answer

Q157) According to the second law of thermodynamics, a process ( reaction ) is spontaneous, if during the process Show Answer

Q158) The law formulated by Nernst is Show Answer

Q159) The reaction is spontaneous if the cell potential. Show Answer

Q160) Free energy change for a reversible process is Show Answer

Q161) Which of the following statements is true ? Show Answer

Q162) The favourable conditions for a spontaneous reaction are Show Answer

Q163) One mole of a perfect gas expands isothermally to ten times its original volume. The change in entropy is Show Answer

Q164) Which of the following pairs, of a chemical reaction, is certain to result in a spontaneous reaction ? Show Answer

Q165) If an endothermic reaction is non - spontaneous at freezing point of water and becomes feasible at its boiling point, then Show Answer

Q166) In an irreversible process taking place at constant T and P and in which only pressure - volume work is being done, the change in Gibb's free energy ( dG)
and change in entropy (dS), satisfy the criteria. Show Answer

Q167) Which of the following conditions regarding the chemical process ensures its spontaneity at all temperatures ? Show Answer

Q168) Which of the following is true for an adiabatic process ? Show Answer

Q169) Which of the following is not a state function ? Show Answer

Q170) When a gas undergoes adiabatics expansion, it gets cooled due to Show Answer

Q171) Which of the following pairs has heat of neutralisation equal to 13.7 kcal ? Show Answer

Q172) Maximum entropy will be in which of the following ? Show Answer

Q173) For equilibrium reaction, value of Gibb's free energy change is Show Answer

Q174) In which case reaction is spontaneous ? Show Answer

Q175) Identify the correct statement regarding a spontaneous process Show Answer

Q176) Among the following, the state function(s) is (are) Show Answer

Q177) Which reaction either endothermic or exothermic characteristics has the greater chance of occurring spontaneously? Show Answer

Q178) Net work done by the system in a cyclic process is equal to: Show Answer

Q179) A thermodynamic quantity is that: Show Answer

Q180) The Gibbs energy change for a reversible reaction at equilibrium is: Show Answer

Q181) The ratio of slopes of log⁡P vs log⁡V for reversible adiabatic process and reversible isothermal process of an ideal gas is equal to: Show Answer

Q182) A boiled egg show a/an …in entropy. Show Answer

Q183) Which unit represents largest amount of energy? Show Answer

Q184) A thermally isolated gaseous system can exchange energy with the surroundings. The mode of transference of energy can be: Show Answer

Q185) Warming ammonium chloride with sodium hydroxide in a test tube is an example of: Show Answer

Q186) The matter has highest entropy in: Show Answer

Q187) Which of the following statement is true? Show Answer

Q188) For an adiabatic process: Show Answer

Q189) Which of the following taking place in the blast furnace is endothermic? Show Answer

Q190) Hess’s law is used to calculate Show Answer

Q191) During an adiabatic process: Show Answer

Q192) For spontaneity of a cell, which is correct? Show Answer

Q193) Work done in reversible isothermal process is given by: Show Answer

Q194) A thermodynamic state function is: Show Answer

Q195) Internal energy of an ideal gas depends on: Show Answer

Q196) When two atoms of hydrogen combine to form a molecule of hydrogen gas, the energy of the molecule is: Show Answer

Q197) Hess’s law is based on Show Answer

Q198) Which is an extensive property of the system? Show Answer

Q199) The apparatus generally used for measuring heat changes is: Show Answer

Q200) Which is not characteristic of thermochemical equation? Show Answer

Q201) Thermochemistry is the study of relationship between heat energy and : Show Answer

Q202) Which of the following is an intensive property? Show Answer

Q203) Change in entropy for a reaction is given by: Show Answer

Q204) At constant pressure and temperature, the direction of any chemical reaction is one where, the … decrease. Show Answer

Q205) Follow definition of ionisation energy. Show Answer

Q206) If a gas has 2 atm and 5 atm pressure at 30℃ and 27℃ respectively. Then it will Show Answer

Q207) When 500 J heat is given to the gas X in an isobaric process its work done comes out as 142.8 J. The gas X is Show Answer

Q208) The efficiency of heat engine is maximum when: Show Answer

Q209) To calculate the amount of work done in joules during reversible isothermal expansion of an ideal gas, the volume must be expressed in Show Answer

Q210) Calorific value of carbohydrates is approximately: Show Answer

Q211) Which of the following is correct for an ideal gas : Show Answer

Q212) A spontaneous change is one in which the system suffers Show Answer

Q213) An exothermic reaction is one in which the reacting substances Show Answer

Q214) Which is correct for an endothermic reaction? Show Answer

Q215) When a solid melts, there is: Show Answer

Q216) A closed flask contains water in all its three states, solids, liquid and vapour at 0℃. In this situation the average KE of the water molecule will be: Show Answer

Q217) An isolated system is that system in which: Show Answer

Q218) The entropy of the universe: Show Answer

Q219) When two moles of hydrogen expands isothermally against a constant pressure of 1 atm, at 25℃ from 15 L to 50 L, the work done (in litre atm) will be Show Answer

Q220) The first law of thermodynamic is expressed as Show Answer

Q221) Which value of heat of formation indicates that the product is the least stable? Show Answer

Q222) A process is taking place at constant temperature and pressure. Then Show Answer

Q223) Based on the first law of thermodynamics, which one of the following is correct? Show Answer

Q224) In which case, a spontaneous reaction is possible at any temperature? Show Answer

Q225) Select the incorrect statement : Show Answer

Q226) An isothermal process is associated with: Show Answer

Q227) At 27℃ one mole of an ideal gas is compressed isothermally and reversible from a pressure of 2 atm to 10 atm. The value of ∆E and q are (R=2 cal) Show Answer

Q228) Which one of the following is an exothermic reaction? Show Answer

Q229) If liquids A and B from an ideal solution, the: Show Answer

Q230) In which of the following cases entropy decreases? Show Answer

Q231) Which of the following is correct option for free expansion of an ideal gas under adiabatic condition? Show Answer

Q232) Which of the following is a path function? Show Answer

Q233) The work done by a system is 8 J, when 40 J heat is supplied to it. The change in internal energy of the system during the process is: Show Answer

Q234) Heat of reaction at constant volume is equal to : Show Answer

Q235) Which are correct to express work terms? Show Answer

Q236) In which of the following condition a chemical reaction can not occur? Show Answer

Q237) Which is not a spontaneous process? Show Answer

Q238) Entropy change of fusion at constant pressure is given by: Show Answer

Q239) When hydrogen and oxygen burn to form water in an oxyhydrogen torch, the entropy change is: Show Answer

Q240) The gas in a refrigerator causes cooling on expansion because: Show Answer

Q241) The temperature coefficient of e.m.f. of a cell can be given by: Show Answer

Q242) The internal energy of one mole of a gas is: Show Answer

Q243) The correct thermochemical equation is : Show Answer

Q244) In which of the following reactions, standard reaction entropy change (∆S°) is positive and standard Gibbs’s energy change (∆G°) decreases sharply with increasing temperature? Show Answer

Q245) A gaseous reaction was carried out, first keeping the volume constant and next keeping the pressure constant. In the second experiment, there was an increase in volume. The heats of reaction were different, because : Show Answer

Q246) A positive change in enthalpy occurs in : Show Answer

Q247) A gas expands isothermally and reversibly. The work done by the gas is: Show Answer

Q248) Minimum work is obtained when 1 kg of … gas expanded under 500 kPa to 200 kPa pressure at 0℃. Show Answer

Q249) The temperature of the system decreases in an Show Answer

Q250) Internal energy and pressure of a gas of unit volume are related as: Show Answer

Q251) We believe in the laws of thermodynamics because they are Show Answer

Q252) If a chemical change is brought about by one or more methods in one or more steps, then the amount of heat absorbed or evolved during the complete course of reaction is same, whichever method was followed. This law is known as : Show Answer

Q253) The change in entropy, ∆S is positive for an endothermic reaction. If enthalpy charge ∆H occurs at the same temperature T, then the reaction is feasible: Show Answer

Q254) A reaction accompanied with the absorption of energy is : Show Answer

Q255) Which of the following is an endothermic reaction? Show Answer

Q256) The second law of thermodynamics introduced the concept of: Show Answer

Q257) The total amount of energy in the universe is fixed, but: Show Answer

Q258) Which compound will absorb the maximum amount of heat when dissolved in the same amount of water? (Integral heats of solution at 25⁰C in kcal/mol of each solute are given in brackets): Show Answer

Q259) A container has hydrogen and oxygen mixture in ratio of 1 : 1 by weight, then Show Answer

Q260) Which one is not a spontaneous process? Show Answer

Q261) The enthalpy change is negative for : Show Answer

Q262) 1 mole of gas occupying 3 L volume is expanded against a constant external pressure of 1 atm to a volume of 15 litre. The work done by the system is: Show Answer

Q263) Which reaction is endothermic in nature? Show Answer

Q264) If 50 calorie are added to a system and system does work of 30 calorie on surroundings, the change in internal energy of system is: Show Answer

Q265) Work done in reversible adiabatic process is given by: Show Answer

Q266) If a refrigerator’s door is opened then, we get Show Answer

Q267) Hess’s law is related to: Show Answer

Q268) When a bottle of perfume is opened, odourous molecules mix with air and slowly diffuse throughout the entire room. The incorrect fact about the process is; Show Answer

Q269) Heat of dissociation of benzene of elements is 5335 kJ/mol. The bond enthalpies of
| | | | |
–C-C-;C=C and –C-H
| | | | |
bonds are 347.3, 615 and 416.2 kJ respectively. Resonance energy of benzene is
Show Answer

Q270) Equilibrium constant of a reaction is related to: Show Answer

Q271) 2 mole of ideal gas at 27℃ temperature is expanded reversibly from 2 litre to 20 litre. Find entropy change (R=2 cal/mol K). Show Answer

Q272) 48 g of C (diamond) on complete combustion evolves 1584 kJ of heat. The standard heat of formation of gaseous carbon is 725 kJ/mol. The energies required for the process
(i)C (graphite) → C(gas)
(ii)C (diamond) → C(gas)are:
Show Answer

Q273) Work done by the system on surroundings is: Show Answer

Q274) An example of closed system is: Show Answer

Q275) What is ∆E for system that does 500 cal of work on surrounding and 300 cal of heat is absorbed by the system? Show Answer

Q276) Hess’s law of constant heat summation is an application of : Show Answer

Q277) Which fuel provides the highest calorific value? Show Answer

Q278) 2.1 g of Fe combines with S evolving 3.77 kJ. The heat of formation of FeS in kJ/mole is Show Answer

Q279) In an isochoric process, the increase in internal energy is Show Answer

Q280) The heat of reaction at constant pressure is equal to : Show Answer

Q281) Select the correct limitations of III law of thermodynamics. Show Answer

Q282) Human body is an example of Show Answer

Q283) A hypothetical reaction A→2B, proceeds through following sequence of steps
(i) A→C;∆H=q (ii)C→D;∆H=v
(iii)1/2 D→B; ∆H=x
Then the heat of reaction i
Show Answer

Q284) Decrease in Gibbs energy of a reacting system indicates to: Show Answer

Q285) Molar heat capacity of a gas at constant temperature and pressure is : Show Answer

Q286) The process of evaporation of a liquid is accompanied by: Show Answer

Q287) Among them intensive property is Show Answer

Q288) The work done during the process when 1 mole of gas is allowed to expand freely into vacuum is: Show Answer

Q289) 1 litre-atmosphere is equal to: Show Answer

Q290) The van’t Hoff reaction isotherm is: Show Answer

Q291) Which species have negative value of specific heat? Show Answer

Q292) Which of the following have same units?
(i) work (ii) Heat
(iii) Energy (iv) Entropy Show Answer

Q293) For an ideal gas, the relation between the enthalpy change and internal energy change at constant temperature is given by : Show Answer

Q294) Vibrational energy is: Show Answer

Q295) When water is added to quick lime, the reaction is : Show Answer

Q296) Least random state of water is: Show Answer

Q297) Absorption of gasses on solid surface is generally exothermic because Show Answer

Q298) Energy equivalent to one erg, one joule and one calorie are in order: Show Answer

Q299) When the change of entropy is greater, then the ability for work is: Show Answer

Q300) Net work done by a system is given by: Show Answer

Q301) The law of Lavoisier and Laplace is based on : Show Answer

Q302) The incorrect expression among the following is: Show Answer

Q303) Which statements are correct? Show Answer

Q304) Entropy change of vaporisation at constant pressure is given by: Show Answer

Q305) When ammonium chloride is dissolved in water, the solution becomes cold. The change is: Show Answer

Q306) The Gibbs energy change and standard Gibbs energy change are equal if reaction quotient is equal to: Show Answer

Q307) Bond energy of molecule: Show Answer

Q308) In which case of mixing of a strong acid and a base each of 1N concentration, temperature increase is highest? Show Answer

Q309) Two mole of an ideal gas is expanded isothermally and reversibly from 1 L to 10 L at 300 K. The enthalpy change (in kJ) for the process is Show Answer

Q310) Which one of the following is not a state function? Show Answer

Q311) Temperature and heat are: Show Answer

Q312) The Kirchhoff’s equation gives the effect of …..on heat of reaction. Show Answer

Q313) Which of the following is an intensive property? Show Answer

Q314) If a refrigerator door is kept open, then we get: Show Answer

Q315) Which is correct about the heat of combustion? Show Answer

Q316) The work done by a system in an expansion against a constant external pressure is: Show Answer

Q317) In an isothermal process Show Answer

Q318) For the isothermal expansion of an ideal gas Show Answer

Q319) Which statement(s) is/are correct? Show Answer

Q320) Which is not correct? Show Answer

Q321) Heat of fusion of a molecular solid is : Show Answer

Q322) Which plot represents for an exothermic reaction? Show Answer

Q323) For a spontaneous chemical change the Gibbs energy change is: Show Answer

Q324) An ideal gas undergoing expansion in vacuum shows: Show Answer

Q325) Select the incorrect statement Show Answer

Q326) Entropy decreases during: Show Answer

Q327) Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be: Show Answer

Q328) If gas at constant temperature and pressure expands then its Show Answer

Q329) The temperature of 5 mL of a strong acid increases by 5℃ when 5 mL of strong base is added to it. If 10 mL of each is mixed and complete neutralisation takes place then rise in temperature will be Show Answer

Q330) When an ideal gas is compressed adiabatically and reversibly, the final temperature is: Show Answer

Q331) In a closed insulated container, a liquid is stirred with a paddle to increase its temperature. In this process, which of the following is true Show Answer

Q332) In a closed container, a liquid is stirred with a paddle to increase the temperature. Which of the following is true? Show Answer

Q333) If 900 J/g of heat is exchanged at boiling point of water then increase in entropy Show Answer

Q334) A reaction occurs spontaneously if: Show Answer

Q335) The quantity of heat measured for a reaction in a bomb calorimeter is equal to Show Answer

Q336) If gas, at constant temperature and pressure expands then its Show Answer

Q337) Which has the least entropy? Show Answer

Q338) The amount of heat measured for a reaction in a bomb calorimeter is Show Answer

Q339) A mixture of hydrogen and chlorine on exposure to ultra violet sunlight reacts with explosion. The step involved in the initiation of the reaction is : Show Answer

Q340) It is a general principle that if a system has the less energy then it is: Show Answer

Q341) Statement 1: Internal energy is an extensive property

Statement 2: Internal energy depends upon the amount of the system
Show Answer

Q342) Statement 1: Zeroth law can also be termed as law of thermal equilibrium

Statement 2: Two objects in thermal equilibrium with the third one, are in thermal equilibrium with each other
Show Answer

Q343) The enthalpies of formation of organic substances can be conveniently determined from : Show Answer

Q344) Statement 1: The mass and volume of a substance are the extensive properties and are proportional to each other

Statement 2: The ratio of mass of a sample to its volume is an intensive property
Show Answer

Q345) Statement 1: Absolute values of internal energy of substance can’s be determined

Statement 2: It is impossible to determine exact values of constituent energies of the substances
Show Answer

Q346) The law of conservation of energy states that : Show Answer

Q347) Which is an extensive property? Show Answer

Q348) The process in which pressure remains constant throughout Show Answer

Q349) In an irreversible process taking place at constant T and P and in which only pressure volume work is being done, the change in Gibbs free energy (dG) and change in entropy Show Answer

Q350) Hess’s law states that Show Answer

Q351) Internal energy is sum of Show Answer

Q352) Heat given to a system under isochoric process is equal to: Show Answer

Q353) All the naturally occurring processes, i.e., spontaneous proceed spontaneously in a direction which leads to: Show Answer

Q354) Which phenomena cannot be described as oxidation? Show Answer

Q355) A system provided 50 joule of heat and work done on the system is 10 J. The change in internal energy during the process is: Show Answer

Q356) The standard heat of combustion of solid boron is : Show Answer

Q357) During an isothermal expansion of an ideal gas its: Show Answer

Q358) The exchange of heat energy during chemical reaction at constant temperature and pressure occurs in form of: Show Answer

Q359) For which of the process, ∆S is negative? Show Answer

Q360) In an isobaric process, the ratio of heat supplied to the system (dθ) and work done by the system (dW) for diatomic gas is Show Answer

Q361) An adiabatic process occurs in Show Answer

Q362) The heat of formation of water is exothermic in nature because : Show Answer

Q363) In an adiabatic process Show Answer

Q364) A well stoppered thermos flask containing some ice cubes is an example of: Show Answer

Q365) Internal energy is Show Answer

Q366) The calorific value of fat is : Show Answer

Q367) 16 g oxygen gas expands at STP to occupy double of its original volume. The work done during the process is: Show Answer

Q368) Gibbs energy G, enthalpy H and entropy S are related by: Show Answer

Q369) In a closed insulated container a liquid is stirred with a paddle to increase the temperature, which of the following is true? Show Answer

Q370) The temperature of the system increases during an: Show Answer

Q371) The heat evolved during neutralisation is maximum in the reaction of : Show Answer

Q372) It is impossible to attain the lowest temperature known as zero degree absolute. This is a simple statement of: Show Answer

Q373) The total entropy change for a system and its surroundings increases, if the process is: Show Answer

Q374) Heat of formation of compound is defined as : Show Answer

Q375) At absolute zero, the entropy of a perfect crystal is zero. This is … of thermodynamics. Show Answer

Q376) Heat of solution is defined as : Show Answer

Q377) Molar heat capacity is given by : Show Answer

Q378) What happens when methane undergoes combustion in systems A and B respectively? Show Answer

Q379) Among the following the number of state variables is . . . . .
Internal energy (U)
Volume (V)
Heat (q)
Enthalpy (H) Show Answer

Q380) The correct figure representing isothermal and adiabatic expansions of an ideal gas from a particular initial state is Show Answer

Q381) An ideal gas undergoes isothermal expansion followed by heat removal at constant volume and then by heat removal at constant pressure to the initial volume. The correct description of these steps is indicated by Show Answer

Q382) The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path, what would be the net change in internal energy? Show Answer

Q383) Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following: Show Answer

Q384) Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non-expansion work is zero) Show Answer

Q385) When 2 L of ideal gas expands isothermally into vacuum to a total volume of 6 L, the change in internal energy is . . . . . . . J. (Nearest integer) Show Answer

Q386) 4.0 L of an ideal gas is allowed to expand isothermally into vacuum until the total volume is 20 L. The amount of heat absorbed in this expansion is . . . . . . L atm. Show Answer

Q387) A system does 200 J of work and at the same time absorbs 150 J of heat. The magnitude of the change in internal energy is . . . . . J. (Nearest integer) Show Answer

Q388) The enthalpy change for a reaction does not depend upon the Show Answer

Q389) Three moles of an ideal gas are compressed isothermally from 60 L to 20 L using constant pressure of 5 atm. Heat exchange Q for the compression is - . . . . . .L atm. Show Answer

Q390) Which of the following relation is not correct? Show Answer

Q391) A process will be spontaneous at all temperature if Show Answer

Q392) Which of the following is not correct? Show Answer

Q393) The incorrect expression among the following is Show Answer

Q394) The true statement amongst the following is Show Answer

Q395) The process with negative entropy change is Show Answer

Q396) The incorrect match in the following is Show Answer

Q397) Identify the correct statement regarding a spontaneous process. Show Answer

Q398) A reaction is non-spontaneous at the freezing point of water but is spontaneous at the boiling point of water, when at freezing point Show Answer

Q399) Which of the following is consistent with a spontaneous endothermic reaction? Show Answer