Chemical Kinetics

Chemical Kinetics

These MCQs are intended for checking your Chemistry subject, Chapter Chemical Kinetics knowledge.

For the reaction of 4A + B→ 2C + D. Which of the following statement is not correct?

In the reaction K1 and K2 are the velocity constants for the forward and backward reaction respectively. The equilibrium constant is

(B) K = K1 × K2

(D) None of the above

Rate constant in case of first order reaction is

A first order reaction takes 40 min for 30% decomposition. What will be t12?

The rate constant of a reaction changes when…

In the reaction A + B→ Products, the doubling of [A], increases the reaction rate to four times, but doubling of [B] has no effect on the reaction rate. The rate expression is….

The number of molecules of the reactants taking part in a single step of the reaction is indicative of

Half life period of a first order reaction is 10 min. What percentage of the reaction will be completed in 100 min?

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?

_____does not affect the rate of reaction.

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?

Rate of reaction is defined as

The chemical reaction, 2O3 → 3O2 proceeds as O3  O2 + |O| (fast) |O| + O3 → 2O2 (slow) The rate law expression will be

The rate of reaction of spontaneous reaction is generally very slow. This is due to the fact that:

The unit of rate constant for the reaction 2H2 + 2NO → 2H2O + N2 which has rate = K|H2||NO|², is

A zero order reaction is one whose rate is independent of ……

The order of reaction is decided by

The overall rate of a reaction is governed by

For a reaction pA + qB→ Products. Rate = K[A]m [B]n. Then

In chemical equation H2 (g) + I2 (g)  2HI (g) the equilibrium constant Kp depends on

For the reaction A + B + C→ Products, Rate = K[A]1/2 [B]1/2 [C]. The order of reaction is

For a unimolecular reaction

In the reaction N2O4(g)→2NO2(g) the pressure of N2O4 falls from 0.5 atm to 0.32 atm is 30 minutes, the rate of appearance of NO2(g) is

Which of the following, is an example of a fractional order reaction?

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 ?

If the rate of a reaction is expressed by, rate = A [A]² [B], the order of reaction will be

For a reaction x + y → z, rate ∝ |X|. What is (i) molecularity and (ii) order of reaction?

The rate constant of a reaction depends upon

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?

The unit of rate and rate constant are same for

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