Chemical Kinetics

The rate of a first order reaction is 1.5 10-2 mol L-1 min-1 at 0.5 M concentration of the reactant. The half-life of the reaction is

1. 0.383 min
2. 23.1 min
3. 8.73 min
4. 7.53 min

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k = A e-E*/RT. Activation energy (E*) of the reaction can be calculated by plotting

1. k vs T
2. k vs 1 T
3. log k vs 1T
4. log k vs 1 T

If the rate of the reaction is equal to the rate constant, the order of the reaction is

1. 0
2. 1
3. 2
4. 3

The reaction A B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

1. 1 hour
2. 0.5 hour
3. 0.25 hour
4. 2 hours

The activation energy for a simple chemical reaction A B is Ea in forward direction. The activation energy for reverse reaction

1. is negative of Ea
2. is always less than Ea
3. can be less than or more than Ea
4. is always double of Ea

The radioisotope, tritium (13H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?

1. 1 mg
2. 2 mg
3. 4 mg
4. 8 mg

2A B + C It would be a zero order reaction when

1. the rate of reaction is proportional to square of concentration of A
2. the rate of reaction remains same at any concentration of A
3. the rate remains unchanged at any concentration of B and C
4. the rate of reaction doubles if concentration of B is increased to double

When a bio-chemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is 10-6 times, the activation energy of reaction in the presence of enzyme is

1. 6/RT
2. P is required
3. different from Ea obtained in laboratory
4. can't say anything.

For the reaction; 2N2O5 4NO2 + O2 rate and rate constant are 1.02 10-4 and 3.4 10-5 s-1 respectively, then concentration of N2O5 at that time will be

1. 1.732
2. 3
3. 1.02 10-4
4. 3.4 105

A human body required 0.01 m activity of radioactive substance after 24 hours. Half life of radioactive substance is 6 hours. Then injection of maximum activity of radioactive substance that can be injected is

1. 0.08
2. 0.04
3. 0.16
4. 0.32