Q 1. A hydrogenation reaction is carried out at 500 K. If the same reaction is carried out in the presence of a catalyst at the same rate, the temperature required is 400 K. Calculate the activation energy of the reaction if the catalyst lowers the activation barrier by 20 kJ mol–1. [JEE 2000]
Ans. 100 kJmol–1
Q 2. The rate of first order reaction is 0.04 mole litre–1 s–1 at 10 minutes and 0.03 mol litre–1 s–1 at 20 minutes after initiation. Find the half life of the reaction. [JEE 2001]
Ans. t1/2 = 24.14 min
Q 3.
(in mm of Hg)
Assuming ideal gas condition. Calculate
(A) Order of reaction
(B) Rate constant
(C) Time taken for 75% completion of reaction
(D) Total pressure when Px = 700 mm. [JEE 2005]
Ans.
(A) 1
(B) 6.93 × 10–3 min
(C) 200 min
(D) 950 mm
Q 4. The concentration of R in the reaction R→ P was measured as a function of time and the following data is obtained:
[JEE 2010]
The order of the reaction is
Ans. 0
Q 5. An organic compound undergoes first-order decomposition. The time taken for its decomposition to 1/8 and 1/10 of its initial concentration are t1/8 and t1/10 respectively.
Ans. 0009
FAQs on Previous Year Questions - Chemical Kinetics (IIT - JEE advanced)
| 1. What is chemical kinetics? |  |
Ans. Chemical kinetics is the branch of chemistry that deals with the study of the rate of chemical reactions, the factors affecting it, and the mechanism of the reactions.
| 2. What is the order of a reaction? | |
Ans. The order of a reaction is the sum of the powers of concentrations of reactants in the rate law expression. It is determined experimentally and can be zero, first, second, or even fractional.
| 3. What is the rate-determining step? | |
Ans. The rate-determining step is the slowest step in a reaction mechanism that determines the overall rate of the reaction. It is also known as the rate-limiting step.
| 4. How do catalysts affect the rate of a reaction? | |
Ans. Catalysts increase the rate of a reaction by lowering the activation energy required for the reaction to occur. They do not change the equilibrium constant or the thermodynamics of the reaction.
| 5. What is the Arrhenius equation? | |
Ans. The Arrhenius equation relates the rate constant of a reaction to the activation energy, temperature, and frequency factor. It is given as k=Ae^(-Ea/RT), where k is the rate constant, A is the frequency factor, Ea is the activation energy, R is the gas constant, and T is the absolute temperature.
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