{"id":19104,"date":"2022-06-03T22:00:57","date_gmt":"2022-06-03T16:30:57","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=19104"},"modified":"2022-05-21T12:49:28","modified_gmt":"2022-05-21T07:19:28","slug":"mcq-questions-for-class-12-chemistry-chapter-4","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/mcq-questions-for-class-12-chemistry-chapter-4\/","title":{"rendered":"MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics with Answers"},"content":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics with Answers Pdf free download is available here. MCQ Questions for Class 12 Chemistry with Answers<\/a> are prepared as per the Latest Exam Pattern. Students can solve these Chemical Kinetics Class 12 MCQs Questions with Answers and assess their preparation level.<\/p>\n

Chemical Kinetics Class 12 MCQs Questions with Answers<\/h2>\n

Solving the Chemical Kinetics Multiple Choice Questions of Class 12 Chemistry Chapter 4 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Chemical Kinetics Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 4 Chemistry Class 12 and cross-check your answers during preparation.<\/p>\n

Question 1.
\nA first order reaction has a half life period of 34.65 seconds. Its rate constant is
\n(a) 2 \u00d7 10-2<\/sup> s-1<\/sup>
\n(b) 4 \u00d7 10-4<\/sup> s-1<\/sup>
\n(c) 20 s-1<\/sup>
\n(d) 2 \u00d7 10-4<\/sup> s-1<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 2 \u00d7 10-2<\/sup> s-1<\/sup><\/p>\n<\/details>\n

\n

Question 2.
\nIf a graph is plotted between In k and 1\/T for the first order reaction, the slope of the straight line so obtained is given by
\n(a) –\\(\\frac { E_a }{R}\\)
\n(b) \\(\\frac { E_a }{2.303 R}\\)
\n(c) \\(\\frac { 2.303 }{E_a.R}\\)
\n(d) \\(\\frac { E_a }{2.303}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) –\\(\\frac { E_a }{R}\\)<\/p>\n<\/details>\n

\n

Question 3.
\nThe unit of rate constant for a zero order reaction is
\n(a) mol L-1<\/sup>s-1<\/sup>
\n(b) s-1<\/sup>
\n(c) L mol-1<\/sup>s-1<\/sup>
\n(d) L2<\/sup>mol-2<\/sup>s-1<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) mol L-1<\/sup>s-1<\/sup><\/p>\n<\/details>\n

\n

Question 4.
\nA catalyst increases the speed of a chemical reaction by
\n(a) increasing activation energy
\n(b) decreasing activation energy
\n(c) increasing reactant energy
\n(d) decreasing threshold energy<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) decreasing activation energy<\/p>\n<\/details>\n

\n

Question 5.
\nThe units of the rate constant for the second order reaction are:
\n(a) mol-1<\/sup> litre s-1<\/sup>
\n(b) mol litre-2<\/sup> s-1<\/sup>
\n(c) s-1<\/sup>
\n(d) mol litre-1<\/sup> s-1<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) mol-1<\/sup> litre s-1<\/sup><\/p>\n<\/details>\n

\n

Question 6.
\nThe value of k for a reaction is 2.96 \u00d7 10-30<\/sup> s-1<\/sup>. What is the order of the reaction?
\n(a) Zero
\n(b) 3
\n(c) 2
\n(d) 1<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) 1<\/p>\n<\/details>\n

\n

Question 7.
\nA reaction is found to be of second order with respect to concentration of carbon monoxide. If concentration of carbon monoxide is doubled, the rate of reaction will
\n(a) triple
\n(b) increase by a factor of 4
\n(c) double
\n(d) remain unchanged<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) increase by a factor of 4<\/p>\n<\/details>\n

\n

Question 8.
\nIf the concentrations are expressed in mol litre-1<\/sup> and time in s, then the units of rate constant for the first-order reactions are
\n(a) mol litre-1<\/sup> s-1<\/sup>
\n(b) mol-1<\/sup> litre s-1<\/sup>
\n(c) s-1<\/sup>
\n(d) mol\u00b2 litre-2<\/sup> s-1<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) s-1<\/sup><\/p>\n<\/details>\n

\n

Question 9.
\nThe half life of a first order reaction having rate constant 200 s-1<\/sup> is
\n(a) 3.465 \u00d7 10-2<\/sup> s
\n(b) 3.465 \u00d7 10-3<\/sup> s
\n(c) 1.150 \u00d7 10-2<\/sup> S
\n(d) 1.150 \u00d7 10-3<\/sup> S<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) 3.465 \u00d7 10-3<\/sup> s<\/p>\n<\/details>\n

\n

Question 10.
\nThe rate of a reaction is 1.209 \u00d7 10-4<\/sup>L\u00b2 mol-2<\/sup>s-1<\/sup>. The order of the reaction is:
\n(a) zero
\n(b) first
\n(c) second
\n(d) third<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) third<\/p>\n<\/details>\n

\n

Question 11.
\nA catalyst increases the rate of a reaction by
\n(a) increasing threshold energy
\n(b) increasing activation energy
\n(c) activating the reactants
\n(d) lowering activation energy<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) lowering activation energy<\/p>\n<\/details>\n

\n

Question 12.
\nTime required for 100% completion of a zero order reaction is:
\n(a) t100%<\/sub> = a\/k
\n(b) t100%<\/sub> = a.k
\n(c) t100%<\/sub> = a\/2k
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) t100%<\/sub> = a\/k<\/p>\n<\/details>\n

\n

Question 13.
\nArrhenius equation is represented by:
\n(a) k = AeEa\/RT<\/sup>
\n(b) k = Ae-Ea\/RT<\/sup>
\n(c) t1\/2 = 0.693\/k
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) k = Ae-Ea\/RT<\/sup><\/p>\n<\/details>\n

\n

Question 14.
\nThe overall order of a reaction, which has the rate expression: Rate = AC[A]1\/2<\/sup>[B]3\/2<\/sup> is:
\n(a) First order
\n(b) Second order
\n(c) Third order
\n(d) Zero order<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Second order<\/p>\n<\/details>\n

\n

Question 15.
\nIf half life period of a first order reaction is 100 seconds. Then rate constant will be:
\n(a) 6.93 \u00d7 10-3<\/sup> second-1<\/sup>
\n(b) 6.93 \u00d7 10-2<\/sup> second-1<\/sup>
\n(c) 0.693 second-1<\/sup>
\n(d) 6.93 second-1<\/sup><\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) 6.93 \u00d7 10-3<\/sup> second-1<\/sup><\/p>\n<\/details>\n

\n

Question 16.
\nIf rate constant for a reaction is mole litre-1<\/sup> second-1<\/sup>, then order of reaction is:
\n(a) Zero order
\n(b) First order
\n(c) Second order
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Zero order<\/p>\n<\/details>\n

\n

Question 17.
\nIdentify the order of reaction from the given rate constant k = 2.6 \u00d7 10-4<\/sup> L mol-1<\/sup> s-1<\/sup>
\n(a) First
\n(b) Zero
\n(c) Second
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Second<\/p>\n<\/details>\n

\n

Question 18.
\nFor a reaction: N2<\/sub> + 3H2<\/sub> \u2192 2NH3<\/sub>, the rate of reaction with respect to NH3<\/sub> will be:
\n(a) –\\(\\frac{d\\left[\\mathrm{NH}_{3}\\right]}{d t}\\)
\n(b) –\\(\\frac{d[NH_3]^2}{d t}\\)
\n(c) +\\(\\frac { 1 }{10}\\) \\(\\frac { d[NH_3] }{dt}\\)
\n(d) –\\(\\frac { 1 }{10}\\) \\(\\frac { d[NH_3] }{dt}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) +\\(\\frac { 1 }{10}\\) \\(\\frac { d[NH_3] }{dt}\\)<\/p>\n<\/details>\n

\n

Question 19.
\nHalf life period of a first order reaction depends upon:
\n(a) Concentration of reactants
\n(b) Concentration of products
\n(c) Rate constant of reaction
\n(d) None of these<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Rate constant of reaction<\/p>\n<\/details>\n

\n

Question 20.
\nHalf life period of a first order reaction is:
\n(a) directly proportional to the initial concentration of the reactant
\n(b) half of the rate constant
\n(c) same for all reactions
\n(d) independent of the initial concentration of the reactants<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) independent of the initial concentration of the reactants<\/p>\n<\/details>\n

\n

Assertion and Reason Type Questions<\/span><\/p>\n

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
\n(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
\n(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
\n(c) Assertion (A) is correct, Reason (R) is wrong statement.
\n(d) Assertion (A) is wrong, but Reason (R) is correct statement.<\/p>\n

Question 21.
\nAssertion: Rate of reaction increases with increase in temperature.
\nReason: Number of collisions increases – with increase in temperature.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 22.
\nAssertion: Reactions of higher order are rare.
\nReason: The chances of simultaneous multimolecular collisions are extremely small.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 23.
\nAssertion: The half life period for a first order reaction is independent of initial concentration of reactants.
\nReason: For first order reaction, t1\/2 = \\(\\frac { 0.693 }{k}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 24.
\nAssertion: For the first order reaction the units of rate constant are time-1<\/sup>.
\nReason: The rate of first order reaction remains constant throughout.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 25.
\nAssertion: For a first order reaction, graph of [A] vs. t is a straight line.
\nReason: For first order reaction, k = \\(\\frac { 2.303 }{t}\\) log \\(\\frac { [R]_0 }{[R]}\\)<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.<\/p>\n<\/details>\n

\n

Question 26.
\nAssertion: For complex reactions molecularity and order are not same.
\nReason: Order of a reaction may be zero.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 27.
\nAssertion: A catalyst increases the rate of a reaction.
\nReason: A catalyst forms an activated complex of lower potential energy.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Question 28.
\nAssertion: The molecularity of the reaction
\nH2<\/sub> + Br2<\/sub> \u2192 2HBr is 2.
\nReason: Order of the reaction is 3\/2.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 29.
\nAssertion: For the reaction:
\nRCl + NaOH (aq) \u2192 ROH + NaCl, the rate of reaction is reduced to half when the concentration of RCl is reduced to half.
\nReason: The rate of reactions is represented by k[RCl], i.e. it is a first order reaction.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.<\/p>\n<\/details>\n

\n

Question 30.
\nAssertion: Photochemical reactions always occur in the presence of light.
\nReason: Photochemical reactions even with, \u0394G = +ve occur.<\/p>\n

\nAnswer<\/span><\/summary>\n

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).<\/p>\n<\/details>\n

\n

Hope the information shared regarding the NCERT MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics with Answers Pdf free download is true and genuine as far as our knowledge is concerned. If you feel any information regarding CBSE Class 12 Chemistry Chemical Kinetics MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly.<\/p>\n","protected":false},"excerpt":{"rendered":"

Students are advised to practice the NCERT MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics with Answers Pdf free download is available here. MCQ Questions for Class 12 Chemistry with Answers are prepared as per the Latest Exam Pattern. Students can solve these Chemical Kinetics Class 12 MCQs Questions with Answers and assess …<\/p>\n

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