For the elementary step,

(CH₃)_3.CBr(aq) → (CH₃)₃C⁺ (aq) + Br^- (aq) the molecularity is:

1. zero

2. 1

3. 2

4. cannot ascertained

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

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.

The rate constant of a second-order reaction is 10^-2 mol^-1 litre s^-1 The rate constant expressed in cc molecule^-1min^-1 is:

1. 9.96 x 10^-22

2. 9.96 x 10^-23

3. 9.96 x 10^-21

4. 1.004 x 10^-24

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

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

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

For A + B $\to$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.

For the elementary reaction M $\to$ N, the rate of disappearance of M increases by a factor of 8 upon doubling the concentration of M. The order of the reaction with respect to M will be:

1. 4

2. 3

3. 2

4. 1