In the reaction A + B → C, if the concentration of A reduces from 4M to 2M in 1 hour, followed by a reduction from 2M to 1M in 0.5 hours, the order of the reaction is:

1. One

2. Zero

3. Two

4. Three

A gaseous reaction A₂(g) → B(g) + $\frac{1}{2}C$(g) shows increase in pressure from 100 mm to 120 mm in 5 minutes. The rate of disappearance of A₂ will be : 

During the formation of ammonia by Haber's process N₂ + 3H₂ → 2NH₃, the rate of appearance of NH₃ was measured as 2.5 x 10^-4 mol L^-1 s^-1. The rate of disappearance of H₂ will be: 

1. 2.5 x 10^-4 mol L^-1 s^-1

2. 1.25 x 10^-4 mol L^-1 s^-1

3. 3.75 x 10^-4 mol L^-1 s^-1

4. 15.00 x 10^-4 mol L^-1 s^-1

For a chemical reaction, A $\to$  products, the rate of reaction doubles when the concentration of A is increased by 4 times. The order of the reaction is 

1. 4

2. 0

3. 1/2

4. 1

The correct expression for the 3/4th life of a first-order reaction is:
\(1 .  \frac{k}{2 . 303} log \frac{4}{3}\)
\(2 .  \frac{2 . 303}{k} log \frac{3}{4}\)
\(3 .  \frac{2 . 303}{k} log\) \(4\)
\(4 .  \frac{2 . 303}{k}\) \(log\) \(3\)$\mathrm{}$

From the plot of log k vs 1/T, following parameter can be calculated:

1. Activation energy.

2. Rate constant of reaction .

3. Order of reaction.

4. Activation energy as well as the frequency factor.

Find the minimum possible value of activation energy, Eₐ, for an endothermic reaction having enthalpy change ΔH.

1. Less than ΔH

2. Zero

3. More than ΔH

4. Equal to ΔΗ

In the formation of sulphur trioxide by the contact process:

2SO₂(g) + O₂(g) $\to$2SO₃(g)

The rate of reaction is expressed as $\frac{\mathrm{d}\left[{\mathrm{O}}_2\right]}{\mathrm{dt}}$= 2.5×10^–4 mol L^–1 sec^–1. Find the rate of disappearance of SO₂ :

1. 5.0×10^–4 mol L^–1sec^–1

2. 2.5×10^–4 mol L^–1sec^–1

3. 3.75×10^–4 mol L^-1sec^–1

4. 50.0×10^–4 mol L^–1sec^–1

A first order reaction complete 40% in 20 minutes. In how much time it is completed 90% of its original amount?

1. 45 min

2. 60 min 

3. 75 min

4. 90 min

The dissociation of H₂O₂ is a first order reaction. The half life for '16 V H₂O₂ is 30 min, calculate the time at which the solution is 1V H₂O₂ ?

1. 120 min.

2. 90 min.

3.  60 min.

4.  150 min.