MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics Part-1 with Answers

Chemical Kinetics Part-1 Class 12 Chemistry MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 4 Chemical Kinetics Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Chemistry with Answers were prepared based on the latest exam pattern. We have Provided Chemical Kinetics Part-1 Class 12 Chemistry MCQs Questions with Answers to help students understand the concept very well.

Class 12 Chemistry Chapter 4 Quiz

Class 12 Chemistry Chapter 4 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Chemistry Chapter 4 Chemical Kinetics Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Chemical Kinetics Part-1 Class 12 Chemistry MCQ online test

Q1.	In chemical equation H₂ (g) + I₂ (g) \(\rightleftharpoons\) 2HI (g) the equilibrium constant K_p depends on
	A.total pressure
	B.catalyst used
	C.amount of H₂ and I₂
	D.temperature

Ans: catalyst used

Q2.	If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be
	A.2
	B.3
	C.1
	D.0

Ans: 3

Q3.	In a reaction, 2X → Y, the concentration of X decreases from 0.50 M to 0.38 M in 10 min. What is the rate of reaction in Ms^-1 during this interval ?
	A.2 × 10^-4
	B.4 × 10^-2
	C.2 × 10^-2
	D.1 × 10^-2

Ans: 2 × 10^-4

Q4.	The decomposition of dimethyl ether is a fractional order reaction. The rate is given by rate =k(PCH₃OCH₃)^3/2. If the pressure is measured in bar and time in minutes, then what are the units of rate and rate constant?
	A.bar min^-1, bar² min^-1
	B.bar min^-1, bar^1/2 min^-1
	C.bar^1/2 min^-1, bar² min^-1
	D.bar min^-1, bar^1/2 min^-1

Ans: bar min^-1, bar^1/2 min^-1

Q5.	A reaction in which reactants (R) are converted into products (P) follows second order kinetics. If concentration of R is increased by four times, what will be the increase in the rate of formation of P?
	A.9 times
	B.4 times
	C.16 times
	D.8 times

Ans: 16 times

Q6.	Which of the following, is an example of a fractional order reaction?
	A.NH₄NO₂ → N₂ + 2H₂O
	B.NO + O₃ → NO₂ + O₂
	C.2NO + Br₂ → 2NOBr
	D.CH₃CHO → CH₄ + CO

Ans: CH₃CHO → CH₄ + CO

Q7.	The unit of rate constant for the reaction 2H₂ + 2NO → 2H₂O + N₂ which has rate = K\|H₂\|\|NO\|², is
	A.mol L^-1 s^-1
	B.s^-1
	C.mol^-2 L² s^-1
	D.mol L^-1

Ans: mol^-2 L² s^-1

Q8.	Fora reaction x + y → z, rate ∝ \|X\|. What is (i) moleculariiy and (ii) order of reaction?
	A.(i)2, (ii) 1
	B.(i)2,(ii) 2
	C.(i) 1, (ii) 1
	D.(i) 1, (ii) 2

Ans: (i)2, (ii) 1

Q9.	For a reaction nx – y → z the rate of reaction becomes twenty seven times when the concentration of X is increased three times. What is the order of the reaction?
	A.2
	B.1
	C.3
	D.0

Ans: 3

Q10.	The rate constant of a reaction depends upon
	A.temperature of the reaction
	B.extent of the reaction
	C.initial concentration of the reactants
	D.the time of completion of reaction

Ans: the time of completion of reaction

Q11.	The chemical reaction, 2O₃ → 3O₂ proceeds as O₃ \(\rightleftharpoons\) O₂ + \|O\| (fast) \|O\| + O₃ → 2O₂ (slow) The rate law expression will be
	A.Rate = k [O] [O₃]
	B.Rate = k [O₃]² [O₂]^-1
	C.Rate = k [O₃]²
	D.Rate = k [O₂] [O]

Ans: Rate = k [O₃]² [O₂]^-1

Q12.	The unit of rate and rate constant are same fora
	A.zero order reaction
	B.first order reaction
	C.second order reaction
	D.third order reaction

Ans: zero order reaction

Q13.	The number of molecules of the reactants taking part in a single step of the reaction is indicative of
	A.order of a reaction
	B.molecuiarity of a reaction
	C.fast step of the mechanism of a reaction
	D.half-life of the reaction

Ans: molecuiarity of a reaction

Q14.	Fora unimolecular reaction
	A.the order and molecuiarity of the slowest step are equal to one
	B.molecuiarity of the reaction can be zero, one or two
	C.molecuiarity of the reaction can be determined only experimentally
	D.more than one reacting species are involved in one step

Ans: the order and molecuiarity of the slowest step are equal to one

Q15.	The overall rate of a reaction is governed by
	A.the rate of fastest intermediate’step
	B.the sum total of the rates of all intermediate steps
	C.the average of the rates of all the intermediate steps
	D.the rate of slowest intermediate step

Ans: the rate of slowest intermediate step

Q16.	The order of reaction is decided by
	A.temperature
	B.mechanism of reaction as well as relative concentration of reactants
	C.molecularity
	D.pressure

Ans: mechanism of reaction as well as relative concentration of reactants

Q17.	Rate constant in case of first order reaction is
	A.inversely proportional to the concentration units
	B.independent of concentration units
	C.directly proportional to concentration units
	D.inversely proportional to the square of concentration units

Ans: independent of concentration units

Q18.	Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?
	A.25%
	B.50%
	C.99.9%
	D.75%

Ans: 99.9%

Q19.	In pseudo unimolecular reactions
	A.both the reactants are present in low concentration
	B.both the reactants are present in same concentration
	C.one of the reactant is present in excess
	D.one of the reactant is non-reactive