**Questions: 2022**

- Derive the integrated rate equation for the first order reaction. Hence prove that half-life period is independent of initial concentration of the reactant.
- Time for half-life change for a first order reaction is 25 sec. Find the time taken for the completion of 99.9% reaction.
- Calculate the overall order of a reaction which has the rate expression of Rate =K[A]
^{1/2}[B]^{3/2} - The rate constant for a reaction of zero order in A is 0.0030 mol/L/sec. How long will it take for the initial concentration to fall from 0.10M to 0.075M?

**Questions: 2021**

- The inversion of cane sugar is represented by the reaction,

C_{12}H_{22}O_{11} + H_{2}O ———> C_{6}H_{12}O_{6} + C_{6}H_{12}O_{6}

(i) What is the order of this reaction?

(ii) Give one condition that determines the order of this reaction.

- For zero order reaction, R –> P, derive the integrated rate equation and find its half-life time period.

**Questions: 2020**

- For a reaction, the first order rate constant at 600 K is 1.60 x 10
^{-5}S^{-1}. Its energy of activation is 209 kJ/mol. Calculate the rate constant of the reaction at 700 K. - Define half-life period of a chemical reaction.
- What is the overall order of the reaction: CHCl
_{3}+ Cl_{2}→ CCl_{4 }+ HCl, with rate expression, r = k [CHCl_{3}][Cl_{2}]^{½}? Is this reaction an elementary reaction? Give reason. - For first order reaction, prove that t
_{99% }=10 x t_{50%}or t_{99.99%}= 10 t_{½} - Write Arrhenius equation and indicate the terms involved.

**Questions:2019**

- When does the average rate of a reaction become equal to instantaneous rate? 1
- Write any one condition under which a bimolecular reaction may be kinetically of first order.
- Half-life period of a reaction increases with increase in initial concentration. Predict the order of the reaction.
- Decomposition of a compound follows first order kinetics. If it takes 15 minutes for 20% of original substance to decay, calculate – (i) Rate constant & (ii) The time at which 10% of the reactant remains undecayed.

**Questions: 2018**

- Calculate the overall order of a reaction which has the rate expression, r = k [A]
^{1/2}[B]^{3/2}. - What is the rate determining step of a reaction?
- What is the order of reaction whose rate constant has the same unit as the rate of reaction?
- Thermal decomposition of a compound is of first order. 50% decomposes in 120 minutes. How long will it take for 90% decompose?

**Questions: 2017**

- Write any tow differences between order and molecularity of a reaction.
- Write Arrhenius equation which relates the rate constant with temperature.
- A first order reaction takes 40 minutes for 30% decomposition. Calculate half-life.

**Questions: 2016**

- For first order reaction, it takes 5 minutes for the initial concentration of 0.6 mol /L to become 0.4 mol /L. How long will it take for the initial concentration to become 0.3 mol /L?
- Drive the integrated rate equation for the first order. Hence prove that half-life period for it is independent of initial concentration.

**Questions: 2015**

- Derive the general expression for the rate constant k for a first-order reaction.
- The initial concentration of N
_{2}O_{5}in the following first-order reaction N_{2}O_{5}(g) → 2NO_{2}(g) + ½O_{2}(g), was 1.24 x 10^{-2}mol /L at 318 K. The concentration of N_{2}O_{5}after 60 minutes was 0.20 x 10^{-2}mol /L. Calculate the rate constant of the reaction at 318 K. - Define pseudo first-order reaction. Give an example.
- The time required for 10% completion of a first-order reaction at 298 K is equal to that required for its 25% completion at 308 K. Calculate the energy of activation.
- What is meant by half-life period of a chemical reaction? Give the expression for half-life of a first-order Reaction.