Practice Test

Q1) The units of rate constant and rate of reaction are identical for Show Answer

Q2) The logarithum of rate constant of a reaction Show Answer

Q3) If rate of a reaction is independent of the initial concentration of the reactant, then it belongs to Show Answer

Q4) The influence of temperature on the rate of reaction is given by Show Answer

Q5) The rate of a reaction can be increased in general by all the following factors except Show Answer

Q6) A substance decomposes according to zero order kinetics. If the rate constant is k and initial concentration is a, then half life period is Show Answer

Q7) The increase in rate of a reaction with rise in temperature is mainly due to Show Answer

Q8) The activation energy can be lowered by Show Answer

Q9) Half life period of any first order reaction is Show Answer

Q10) Half life period of a reaction is 50 min. How much time will it take for the reactant to be reduced to 1/8 of the initial concentration? Show Answer

Q11) If 'a' is the initial concentration of a substance which reacts according to zero order kinetics and k is rate constant, the time for the reaction to go to completion is Show Answer

Q12) The effect of catalyst in a chemical reaction is to change the Show Answer

Q13) The specific rate constant for a first order reaction depends on the Show Answer

Q14) A zero order reaction is one Show Answer

Q15) A biological catalyst is Show Answer

Q16) A lump of coal burns slowly in air while coal dust burns explosively. This is because of Show Answer

Q17) The rate of reaction depends on all factors except Show Answer

Q18) The enzyme catalysed reaction is faster than a metal catalysed reaction because its activation energy is Show Answer

Q19) The temperature coefficient for most of the reactions lies between Show Answer

Q20) The ratio of the time required for 3/4 of the reaction and half of the reaction is Show Answer

Q21) In 1.2 years, half of 160 mg of a radioactive isotope decays. The amount present after 6 years is Show Answer

Q22) For the half life period of a first order reaction, which one of the following statements is generally false? Show Answer

Q23) If the half life period for a reaction in A is 100 min, how long will it take [A] to reach 25% of its initial concentration? Show Answer

Q24) If 8.0 g of a radioactive isotope has a half life period of 10 hrs, the half life period of 2.0 g of the same substance is Show Answer

Q25) The half life period of a reaction is 100 min. In 400 min the initial concentration of 2.0 g will become Show Answer

Q26) Which of the following statements is true? Show Answer

Q27) Which one of the following statements is not true regarding catalysis? Show Answer

Q28) The activation energy of a reaction is zero. The rate constant of the reaction Show Answer

Q29) The hydrolysis of ester in alkaline medium is a Show Answer

Q30) If the initial concentration of reactants in a certain reaction is doubled, the half life period of the reaction doubles. The order of the reaction is Show Answer

Q31) The conversion of A to B follows second order kinetics. Doubling the concentration of A will increase the rate of formation of B by Show Answer

Q32) 75% of a first order reaction was completed in 32 minutes. 50% of the reaction was complete in Show Answer

Q33) A first order reaction is 25% complete in one hour. At the end of two hours, the extent of reaction is Show Answer

Q34) What is the half life period of a radiocative substance if 87.5% of any given amount of the substance disintegrates in 40 minutes? Show Answer

Q35) The ratio of the time taken for 99.9% reaction and half change of the reaction is Show Answer

Q36) The free energy change in a photochemical reaction is Show Answer

Q37) In a first order reaction, the concentration of the reactant decreases from 0.8 to 0.4 M in 15 minutes. The time taken for the concentration to change from 0.1 M to 0.025 M is Show Answer

Q38) A reaction involving the different reactants can never be Show Answer

Q39) Which one of the following statement for order of reaction is not correct Show Answer

Q40) A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled. With everything else kept the same, the reate of reaction will Show Answer

Q41) Rate constant depends on Show Answer

Q42) Effect of temperature on reaction rate is given by Show Answer

Q43) The concentration of a reactant changes from 0.03 M to 0.02 M in 25 minutes. The average rate reaction. using time in seconds is Show Answer

Q44) The rate law expression for four reactions are given below. In which case, the percentage increase in the rate of reaction would be maximum when the concentration of A is double? Show Answer

Q45) If the concentrations are expressed in mol litre and time in sec, then the units of the rate constant for the first order reaction are: Show Answer

Q46) The half life period for a first order reaction is 69.3 s. Its rate constant is Show Answer

Q47) For the first order reaction, the half life period is (if k is rate constant and 'a' is initial concentration) : Show Answer

Q48) The rate determining step in a reaction is A + 2B -> C. Doubling the concentration of B would make the reaction to proceed: Show Answer

Q49) For a first order reaction, the plot of t against log (a - x) would give a straight line with a slope equal to: Show Answer

Q50) If half life period for a first order reaction is 2 min. The rate constant is Show Answer

Q51) Starting with one mole of a compound X, it is found that the reaction is 3/4 complete in 1 min. What is the rate constant if the reaction follows first order? Show Answer

Q52) A radioactive substance is reduced to 1/8 of its original concentration in 24 s. The rate constant of the reaction is Show Answer

Q53) Rate of hydrogenation of a reaction where pressure of hydrogen falls from 2.5 atm to 1.9 atm in an hour is Show Answer

Q54) The rate constant for a first order reaction whose half life is 480 sec is Show Answer

Q55) For a first order reaction, the time of a certain percentage change in reactant concentration will be proportional to Show Answer

Q56) For a first order reaction, to obtain a positive slope, we need to plot [A] in the concentration of reactant AB Show Answer

Q57) The decomposition of a substance follows first order kinetics. If its conc. is reduced to 1/8th of its initial value, in 24 minutes, the rate constant of decomposition process is Show Answer

Q58) For a first order reaction, the plot of log k against 1/T is a straight line. The slope of the line is equal to Show Answer

Q59) If the rate of the reaction is equal to the rate constant, the order of reaction is Show Answer

Q60) For a first order reaction, units of rate constant are Show Answer

Q61) Rate of 1st order depends upon Show Answer

Q62) DDT on exposure to water decomposes (half life = 10 years). How much time will it take for its 99% decomposition? Show Answer

Q63) The first order reaction was started with a decimolar solution of the reactant. 8 minutes and 20 seconds later its concentration was found to be M / 100. So the rate constant of the reaction is Show Answer

Q64) The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of reaction with respect to reactant B is Show Answer

Q65) What is the time required for a first order reaction to be 99 % complete, compared to the time taken for the reaction to be 90% complete? Show Answer

Q66) According to law of mass action, rate of a chemical reaction is proportional to Show Answer

Q67) Which of the following reactions ends in finite time? Show Answer

Q68) If 60% of a first order reaction was completed in 60 minutes, 50% of the same reaction would be completed in approximately Show Answer

Q69) Half life period of a first - order reaction is 1386 seconds. The specific rate constant of the reaction is: Show Answer

Q70) Which of these changes with time for a first order reaction?
(a) Rate of Reaction
(b) Rate constant
(c) Half-life Show Answer

Q71) Which one of the following statements for the order of a reaction is incorrect? Show Answer

Q72) For a first order reaction, the time required to reduce initial concentration by a factor of 1/4 is 25 sec. The time required to reduce initial concentration by a factor of 1/6 will be Show Answer

Q73) A reaction is 75% complete in 32 min. The time required for 50% of the reaction to complete will be Show Answer

Q74) Suppose that the rate law for a reaction is:
Rate = k[A] [B]
and that the initial concentration of A and B are equal. If c represents the concentration of both A and B at any time t, then a linear graph will result if Show Answer

Q75) The rate constant are same for three reactions of first, second and third order respectively. Which one is true for rate of three reactions, if the concentration of reactant is less than 1 M? Show Answer

Q76) For a first order reaction, the time required for 99.9% of the reaction to occur is: Show Answer

Q77) The rate of a reaction increases by 2.15 times when the temperature is raised from 300 to 310 K. If k is the rate constant at 300 K, then the rate constant at 310 K will be equal to Show Answer

Q78) The half life period for a reaction was doubled when the initial concentration was doubled. The order of reaction is Show Answer

Q79) For the nth order reaction , k has the units Show Answer

Q80) An endothermic reaction with high activation for the forward reaction is given by the diagram. Show Answer

Q81) Which of the following graph corresponds to second order reaction : Show Answer