Q. No.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 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:
\(1 . \frac{k}{2 . 303} log \frac{4}{3}\)
\(2 . \frac{2 . 303}{k} log \frac{3}{4}\)
\(3 . \frac{2 . 303}{k} log\) \(4\)
\(4 . \frac{2 . 303}{k}\) \(log\) \(3\)
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) 2SO3(g)
The rate of reaction is expressed as = 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.
If the activation energy is 65 kJ then the reaction at 25°C is .......times fast as compared to 0°C :-
1. 2 times
2. 5 times
3. 11 times
4. 16 times
When temperature is increased from 27C to 127C, rate of reaction becomes doubled, then Ea will be?
1. 1.66 kcal.
2. 3.32 kcal.
3. 5.33 kcal.
4. 6.64 kcal.
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