Practice Test

Q1) Which of the following is not a physical change? Show Answer

Q2) Which one of the following process involve chemical reactions? Show Answer

Q3) In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature? Show Answer

Q4) The reaction in which a substance or substances undergo change to produce new substances with new properties is called Show Answer

Q5) Which of the following conditions is necessary for a chemical reaction? Show Answer

Q6) There is an equation 'X', which contains equal number of atoms of each element on both the sides. What is the 'X'? Show Answer

Q7) Which among the following is not a physical change? Show Answer

Q8) Which of the following reactions is an endothermic reaction? Show Answer

Q9) A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation? Show Answer

Q10) Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved? (i) Displacement reaction (ii) Precipitation reaction (iii) Combination reaction (iv) Double displacement reaction Show Answer

Q11) What happens when dilute hydrochloric acid is added to iron filings? Choose the correct answer. Show Answer

Q12) Which among the following statement(s) is (are) true? Exposure of sliver chloride to sunlight for a long duration turns grey due to (i) The formation of silver by decomposition of silver chloride. (ii) Sublimation of silver chloride. (iii) Decomposition of chlorine gas from silver chloride. (iv) Oxidation of silver chloride. Show Answer

Q13) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Carbon dioxide turns lime water milky.
Reason (R) : Carbon dioxide sullies the water. Show Answer

Q14) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): A chemical reaction becomes faster at higher temperatures.
Reason (R): At higher temperatures, molecular motion becomes more rapid. Show Answer

Q15) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): After white washing the walls, a shiny white finish on walls is obtained after two to three days.
Reason (R): Calcium oxide reacts with carbon dioxide to form calcium hydrogen carbonate which gives shiny white finish. Show Answer

Q16) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Burning of candle is a physical change
Reason (R): In physical change, no new substance is formed. Show Answer

Q17) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Sodium metal is stored under kerosene.
Reason (R): Metallic sodium melts when exposed to air. Show Answer

Q18) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R): Specific heat of water is quite large. Show Answer

Q19) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): Chips manufactures usually flush bags of chips with gas such as nitrogen.
Reason (R) : Nitrogen gas prevents the oil and fats of the chips from being oxidized. Show Answer

Q20) Gas A, obtained above is a reactant for a very important biochemical process which occurs in the presence of sunlight. Identify the name of the process- Show Answer

Q21) Calcium oxide can be reduced to calcium, by heating with sodium metal. Which compound would act as an oxidizing agent in the above process? Show Answer

Q22) Which of the following are the products obtained from the reaction mentioned in the above case? Product `X` product `Y` Show Answer

Q23) Identify the types of chemical reaction occurring during the combustion of fuel: Show Answer

Q24) On the basis of evolution/absorption of energy, which of the following processes are similar to combustion of fuel?
(i) Photosynthesis in plants.
(ii) Respiration in the human body.
(iii) Decomposition of vegetable matter.
(iv) Decomposition of ferrous sulphate. Show Answer

Q25) `A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road.' Choose the correct reason for the production of black smoke: Show Answer

Q26) `Although nitrogen is the most abundant gas in the atmosphere, it does not combustion.' Identify the correct reason for this statement. Show Answer

Q27) If the reactant or product is present as a solution of water, it is represented as: Show Answer

Q28) The correct way to represent the evolution of gas, is to use which of the following symbol: Show Answer

Q29) Which of the following reaction is balanced? Show Answer

Q30) Which of the following reaction is balanced? Show Answer

Q31) Name the substance getting oxidized and reduced in the above reaction: Show Answer

Q32) Name the type of reaction: Show Answer

Q33) The reduction reaction involves: Show Answer

Q34) The reactions used in black and white photography: Show Answer

Q35) The most reactive and the least reactive elements are: Show Answer

Q36) The type of reaction is: Show Answer

Q37) Choose the correct statements: Show Answer

Q38) The type of chemical reaction that will take place is Show Answer

Q39) What colour change is observed in silver chloride? Show Answer

Q40) The correct balanced chemical equation involves: Show Answer

Q41) When decomposition is carried out by heating, it is called as: Show Answer

Q42) The other silver salt which behaves like silver chloride in sunlight is: Show Answer

Q43) The brown gas envolved on heating of copper nitrate is Show Answer

Q44) Zinc reacts with silver nitrate to form which compounds ? Show Answer

Q45) Assertion :
AgBr is used on photographic and x-ray film.
Reason :
AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction. Show Answer

Q46) Assertion :
Magnesium ribbon keeps on burning in atmosphere of nitrogen.
Reason :
Magnetism reacts with nitrogen to form magnesium nitrides and this reaction is combination reaction. Show Answer

Q47) Assertion :
Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is displacement reaction.
Reason :
Zinc reacts with oxygen to form zinc oxide. Show Answer

Q48) Assertion :
A lead nitrate on thermal decomposition gives lead oxide, brown coloured nitrogen dioxide and oxygen gas.
Reason :
Lead nitrate reacts with potassium iodide to form yellow ppt of lead iodide and the reaction is double displacement as well as precipitation reaction. Show Answer

Q49) All combustion reactions are oxidation reactions. Show Answer

Q50) Which of the following reactions is an exothermic reaction ? Show Answer

Q51) Burning of the candle is a ________ change. Show Answer

Q52) The reaction which decomposes after the supply of heat is called __________. Show Answer

Q53) Electrolysis of water is a decomposition reaction. the mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is ____. Show Answer

Q54) What is the colour of the ash formed when a magnesium ribbon is burnt in the air? Show Answer

Q55) In a double displacement reaction such as the reaction between sodium sulphate solution and barium chloride solution :
(i) exchange of atoms takes place.
(ii) exchange of ions takes place.
(iii) a precipitate is produced.
(iv) an insoluble salt is produced.
The correct option is : Show Answer

Q56) What is the name of the process where fatty foods become rancid ? Show Answer

Q57) Which one of the following precipitates are formed when the carbon dioxide gas is passed through lime water ? Show Answer

Q58) Which law should be kept in mind while we balance chemical equations ? Show Answer

Q59) Shashank was asked to carry out a displacement reaction which would show the following :
(i) Formation of colourless solution
(ii) Black deposits
The reactants he should use are : Show Answer

Q60) The oxidation reaction which produces heat and light is called : Show Answer

Q61) Heating of ferrous sulphate is a type of : Show Answer

Q62) Fusion reaction is also known as : Show Answer

Q63) Which metal is displaced when lead is put in the solution of copper chloride ? Show Answer

Q64) Which of the following reaction is not feasible ? Show Answer

Q65) A dilute ferrous sulphate solution was gradually added to the beaker containing acidified potassium permanganate solution. The light purple colour of the solution fades and finally disappears. Which of the following is the correct explanation for the observation ? Show Answer

Q66) Which of the following gases can be used for storage of fresh sample of an oil for a long time ? Show Answer

Q67) Assertion :
Chemical equations should be balanced.
Reason :
As per the law of conservation of mass, mass can neither be created nor be destroyed. Show Answer

Q68) Assertion :
Hydrogen peroxide is kept in coloured bottles.
Reason :
Hydrogen peroxide is a moderately reactive metal that can react with light or heat slowly to produce water. Show Answer

Q69) Assertion:
Silver bromide is kept in the coloured bottles.
Reason :
Silver bromide is kept in coloured bottles because it decomposes in presence of light. Show Answer

Q70) Assertion :
Colour of copper sulphate solution changes when an iron nail is kept immersed in it.
Reason :
The colour of copper sulphate solution changes when iron nail is kept immersed in it due to the decomposition reaction taking place between iron and copper leading to formation of iron sulphate. Show Answer

Q71) Assertion :
Hydrogen is not included in the activity series of metals.
Reason :
It is because it can lose electrons to form positive ions. Show Answer

Q72) Assertion :
Copper vessels get covered with green coating in rainy season.
Reason :
It is because of the formation of copper carbonate. Show Answer

Q73) Assertion :
Gold and silver do not corrode in moist air.
Reason :
It is because they have low reactivity. Show Answer

Q74) Assertion :
Paint is applied on the iron articles.
Reason :
To protect them from rain. Show Answer

Q75) Assertion :
Photosynthesis is considered as an exothermic reaction.
Reason :
Photosynthesis is an endothermic reaction because sunlight energy is absorbed by green plants during this process. Show Answer

Q76) Assertion :
Silver articles become black after sometime when exposed to sunlight.
Reason :
It is because silver reacts with carbonates present in the air.
Show Answer

Q77) Chemical equations balancing is in accordance with : Show Answer

Q78) The chemical equation which is unbalanced is : Show Answer

Q79) Which of the following is not conveyed by a balanced chemical equation : Show Answer

Q80) Which of the following is true for an unbalanced chemical equation ? Show Answer

Q81) Name the component of our diet, decomposition of which produces the amino acid : Show Answer

Q82) Silver chloride (AgCl) when exposed to sunlight for a long duration turns grey :
Consider the following statements :
(i) the formation of silver by decomposition of silver chloride.
(ii) sublimation of silver chloride
(iii) decomposition of chlorine gas from silver chloride
(iv) oxidation of silver chloride. Show Answer

Q83) Which of the following is a decomposition reaction ? Show Answer

Q84) When electricity is passed through water what kind of reaction takes place ? Show Answer

Q85) Chlorine gas reacts with ___ to form bleaching powder. Show Answer

Q86) Identify the correct statement from the following : Show Answer

Q87) What will happen if we take dry HCl gas instead of aqueous solution of HCl ? Show Answer

Q88) The chemical name of quick lime is : Show Answer

Q89) On passing carbon dioxide through lime water : Show Answer

Q90) Following observations were recorded when calcium oxide reacts vigorously with water. Identify the incorrect observations :
(I) It is an endothermic reaction
(II) slaked lime is produced
(III) Quick lime is produced
(Iv) It is an exothermic reaction Show Answer

Q91) Quick lime combines vigorously with water to form Y which reacts slowly with carbon dioxide in the air to form Z. Show Answer

Q92) Which of the following is an endothermic reaction ? Show Answer

Q93) Which of the following are the products obtained from the reaction mentioned in the above case ? Show Answer

Q94) Identify the types of chemical reaction occurring during the combustion of fuel : Show Answer

Q95) On the basis of evolution / absorption of energy, which of the following processes are similar to combustion of fuel ?
(I) Photosynthesis in plants
(II) Respiration in the human body
(III) Decomposition of vegetable matter
(iv) Decomposition of ferrous sulphate. Show Answer

Q96) ' A student while walking on the road observed that a cloud of black smoke bleached out from the exhaust stack of moving trucks on the road'.
Choose the correct reason for the production of black smoke : Show Answer

Q97) 'Although nitrogen is the most abundant gas in the atmosphere, it does not take part in combustion'. Identify the correct reason for this statement. Show Answer

Q98) Copper displaces which of the following metals from its salt solution ? Show Answer

Q99) Characteristic of the gas evolved during the reaction of zinc with dilute sulphuric acid is : Show Answer

Q100) A reddish-brown residue is obtained when dry hydrogen is passed is passed over a heated oxide of metal M. This residue could be : Show Answer

Q101) Which among the following is a displacement reaction ? Show Answer

Q102) Which is the correct observation for the reaction between granulated zinc and dilute hydrochloric acid ? Show Answer

Q103) Which among the following statements is true? Exposure of silver chloride to sunlight for a long duration turns grey due to:
(i) The formation of silver by decomposition of silver chloride.
(ii) Sublimation of silver chloride.
(iii) Decomposition of chlorine gas from silver chloride.
(iv) Oxidation of silver chloride. Show Answer

Q104) In which of the following , the identify of initial substance remains unchanged ? Show Answer

Q105) The brown gas evolved on heating of copper nitrate is Show Answer

Q106) What is observed when a solution of potassium iodide is added to silver nitrate solution ? Show Answer

Q107) Which of the following is precipitation as well as double displacement reaction ? Show Answer

Q108) which of the following reactions will not take place ? Show Answer

Q109) Which of the following involves combination of two elements? Show Answer

Q110) Oxidation involves
(i) gain of electron
(ii) loss of electron
(iii) addition of oxygen or electronegative element
(iv) removal of hydrogen or electropositive element Show Answer

Q111) The formula of Ammonium phosphate is Show Answer

Q112) Which of the following is the thermal decomposition reaction ? Show Answer

Q113) Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals) Show Answer

Q114) Which of the following reactions is an endothermic process(es)?
(i) Dilution of sulphuric acid
(ii) Sublimation of dry ice
(iii) Condensation of water vapours
(iv) Evaporation of water Show Answer

Q115) Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.
Assertion (A): AgBr is used on photographic and x-ray film.
Reason (R) : AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.
Show Answer

Q116) Displacement reaction can be redox reaction also. Show Answer

Q117) Chemical reactions are those processes where new substances with old properties are formed. Show Answer