Chemical Kinetics - 1 - NEET Chemistry Class 12 Free MCQ Test with solutions

Order of a reaction is experimentally determined quantity so it can be negative fractional or zero.

For 1st order reaction half life is independent of initial concentration of reactant.

k = A exp(-kt)

Carbon – 14 is used in determining the age of organic substances

Catalyst doesnot change the equilibrium constant it only helps in reaching the equilibrium at a faster rate.

The time taken for half the reaction to complete, i.e., the time in which the concentration of a reactant is reduced to half of its original value is called half-life period of the reaction. But it is impossible to perform 100% of the reaction. Whole of the substance never reacts because in every half-life, 50% of the substance reacts. Hence, time taken for 100% completion of a reaction is infinite. 

Collision theory is only applicable to bimolecular reaction.

Rate of reaction is dependent on concentration of reactant

The correct answer is Option C.

Let R be the rate of reaction.
For first order reaction,
R=K[A]¹
⇒K=R[A]^-1
Whereas, K and [A] are rate constant and initial concentration of reactant respectively.
Therefore,
Unit of rate constant =(mol L^-1)^1-nsec^-1
For first order reaction, n=1
Unit of rate constant = sec^-1
Hence the unit of rate constant for first order reaction is sec^-1.

Rate constant is independent of concentration of reactant.

In acid catalysed hydrolysis of ethylacetate the water is in excess so it is pseudo 1st order reaction.

Decomposition of N₂O₅ is 1st order reaction.

As rate k = [RCl] , on decreasing the concentration of RCl to half , the rate will also be halved . Rate will also increase with temperature.

Temperature coefficient is the factor by which the rate constant of a reaction increase with increase in temperature by 10°C. It lies between 2 and 3.

Rate of reaction is determined by slowest step.