The rate of a reaction get doubles when the temperature changes from 7°C to 17°C. By what factor will it change for the temperature change from 17°C to 27°C?

1. 1.81

2. 1.71

3. 1.91

4. 1.76

Subtopic:  Arrhenius Equation |
 69%
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In the Arrhenius equation K = Ae-Ea/RT, the quantity e-Ea/kT is referred as:

1. Boltzmann factor.

2. Frequency factor.

3. Activation factor.

4. None of the above.

Subtopic:  Arrhenius Equation |
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For the elementary step, (CH3)3.CBr(aq) → (CH3)3C+ (aq) + Br- (aq), the molecularity is:

1. Zero

2. 1

3. 2

4. Cannot be ascertained

Subtopic:  Order, Molecularity and Mechanism |
 70%
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When ethyl acetate was hydrolysed in pressure of 0.1 N HCl, the rate constant was found to be 5.40 x 10-5 sec-1 . But when 0.1 N H2SO4 was used for hydrolysis, the rate constant was found to be 6.25 X10-5sec-1. Thus, it may be concluded that:

1. H2SO4 is stronger than HCI

2. H2SO4 is weaker than HCl

3. H2SO4 and HCl both have the same strength

4. The data are not sufficient to compare the strength of H2SO4 and HCI

Subtopic:  Definition, Rate Constant, Rate Law | Catalyst |
 70%
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The half time of a second order reaction is:

1. Inversely proportional to the square of the initial concentration of the reactants.

2. Inversely proportional to the initial concentration of the reactants.

3. Proportional to the initial concentration of reactants.

4. Independent of the initial concentration of reactants.

Subtopic:  First Order Reaction Kinetics |
 72%
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The rate constant of a second-order reaction is
102 mol–1 litre s–1 . The rate constant expressed in cc molecule–1 min–1 is:

1. 9.96 × 10–22

2. 9.96 × 10–23

3. 9.96 × 10–21

4. 1.004 × 10–24

Subtopic:  First Order Reaction Kinetics |
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The half-life period of a first order chemical reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be (log 2 = 0.301):

1. 23.03 minutes

2. 46.06 minutes

3. 460.6 minutes

4. 230.3 minutes

Subtopic:  First Order Reaction Kinetics |
 77%
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A drop of solution (volume 0.05 mL) contains 3.0 x10-6 mole of H+. If the rate constant of disappearance of H+ is 1.0x107 mol litre sec?. How long would it take for H+ in drop to disappear?

1. 6x10-8 sec

2. 6x10-7 sec

3. 6x10-9 sec

4. 6x10-10 sec

Subtopic:  Order, Molecularity and Mechanism |
 56%
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A zero order reaction is one:

1. in which reactants do not react

2. in which one of the reactants is in large excess

3. whose rate does not change with time

4. whose rate increases with time

Subtopic:  Order, Molecularity and Mechanism |
 71%
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For A + B → C + D, H = -20 kJ mol-1 , the activation energy of the forward reaction is 85 kJ mol-1. The activation energy for the backward reaction is…. kJ mol-1.

1. 105 2. 85
3. 40 4. 65
Subtopic:  Arrhenius Equation |
 76%
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