# Chemical Kinetics Questions

## Chemical KineticsPseudo First Order Reaction

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## CHEMICAL KINETICS Questions and Answers PDF

Chemical Kinetics All Topics Are Cover Click One By One To Read Everythings

1. According to Arrhenius equation, rate of reaction increases with increase in temp. Give reasons.

Ans. With increase in temp. the kinetic energy of the molecules increases. So that number of effective collision increases giving more product. Hence rate of reaction increases.

1. How is rate constant related to conc. of the reactant ?

Ans. Rate constant is independent of conc. of
reactant.

1. Write two factors which influence the rate of reaction.

Ans. Concentration of reactant and tempeature.

4. What is the order of overall reaction ?

Ans. Order is deternmined from the slowest step. So order of the reaction is

1. What is the unit of rate constant for 2nd order reaction ?

Ans. Mole–¹ lit sec–¹

1. Calculate order of the reaction having rate expression, rate = K[A]2[B]3

Ans. Order = 3/2 + 1/2 = 2

1. Give an example of zero order reaction.

Ans. Decomposition of ammonia giving nitrogen and hydrogen in presence of Pt–catalyst at 800° is an
example of zero order reaction.
2NH³ N²+ 3H²
Rate K [NH³] ⁰

1. Express the rate of reaction for the reaction A, + 3B–→ 2AB³ in terms of reactants and products.

Ans. Rate of reaction
=dA²/dt = – 1/3 (d)B²/ dt=+ 1/2 d[AB³]/dt

1. Define rate of reaction.

Ans. It is defined as the amount of reactant
Consumed or amount of product formed per unit time.

Rate of reaction=-(DX/dt) (w.r.t. reactant)= +(dx/dt) w. r.t. product)

1. What is the relationship between activation energy and threshold energy ?

Ans. Eà= Eth-ER
Where Eà =activation energy of reactant
Eth= threshold energy
ER = average kinetic energy of reactant.

1. Write the unit of rate of reaction.

Ans. mole lit–¹ sec–¹

1. A substance with initial concentration 2M follows zero order kinetics with rate constant 2 x 10 M sec. How long will this reaction take to go to completion ?

Ans. We know K = x/t

Here x 2M, K = 2 x 10-2M sec

t=x/k{ 2m/ 2×10 M sec=100 sec

Hence it will take 100 sec for completion of the
reaction.

1. The rate of reaction is doubled for every 10°C rise in temperature. If the temp is raised from 30°C to 70°C the rate of reaction will be increased by how many times ?

Ans. Rise in temperature 40°C
Rate of reaction will be, 24=16 times the initial rate.

1. Inversion of Cane Sugar is an example of -order reaction.

Ans. Pseudofirst

1. What is the relationship between rate constant and half life period of a 1st order reaction ?

Ans. t1/2=(0.693/k)
K = rate constant of the reaction.
half life period of the reaction.

1. Activation energy for a chemical reaction depends upon.

Ans. Nature of reactant.

1. For a 1st order reaction the time required for times, the time required 75% completion is – for 50% completion.

Ans. 2

1. In all reactions increase in concentration of reactants increases rate of reaction. Yes or No.

Ans. No, in zero order reactions rate of reaction is independent of concentration of reactant.

1. The unstable intermediate compound formed by reactants after absorption of activation energy is called as___

Ans. Activated complex

1. Decomposition of H202 takes place in the following way

H2O,→ H20+0] x 2 (slow)

## O+0- 02 (fast)

2H202→2H20+02
What is the order of overall reaction ?

Ans. Order is determined from the slowest step. So order of the reaction is 1.