Chemical Kinetics MCQs for NEET — Chemistry Questions with Answers

In the following first order competing reactions:

A + Reagent $\to$ Product

B + Reagent $\to$ Product

The ratio of K₁/K₂ if only 50% of B will have been reacted when 94% of A has been reacted in same time is:

For a reversible reaction A $\underset{k_2}{\overset{k_1}{\rightleftharpoons }}$ B, Ist order in both the directions, the rate of reaction is given by:

The time for half-life of a first order reaction is 1 hr. What is the time taken for 87.5% completion of the reaction?

Which order of reaction obeys the relation t_1/2 = 1/Ka?

The chemical reaction, 2O₃ $\to$3O₂ proceeds as follows;

O₃ $\rightleftharpoons$O₂ + O .....(Fast)

O+O₃ $\to$ 2O₂ ....(Slow)

The rate law expression should be:

The rate of reaction becomes 2 times for every 10°C rise in temperature. How the rate of reaction will increase when temperature is increased from 30°C to 80°C?

The rate constant (K) for the reaction 2A +B $\to$ Product was found to be 2.5x10^-5 litre mol^-1 sec^-1 after 15 sec, 2.60 x10^-5 litre mol^-1sec^-1 after 30 sec and 2.55 x10^-5litre mol^-1 sec^-1 after 50 sec. The order of reaction is:

A reaction A₂ + B₂ $\to$ 2AB occurs by the following mechanism;

A₂ $\to$ A + A               .....(slow)

A + B₂ $\to$ AB + B       .....(fast)

A + B $\to$ AB               .....(fast)

Its order would be:

For a given reaction, presence of catalyst reduces the energy of activation by 2 kcal at 27$°$C. The rate of reaction will be increased by:

What fraction of a reactant showing first order remains after 40 minute if t_1/2 is 20 minute?