Question:
Choose the correct set of reactions which follow first order kinetics:
(i) Thermal decomposition of HI on gold surface.
(ii) Thermal decomposition of $N_2O_5(g)$ at constant volume.
(iii) Hydrogenation of ethene.
(iv) Decomposition of $NH_3$ on a hot Pt surface.
(v) Thermal decomposition of $SO_2Cl_2(g)$ at constant volume.
Choose the correct set of reactions which follow first order kinetics:
(i) Thermal decomposition of HI on gold surface.
(ii) Thermal decomposition of $N_2O_5(g)$ at constant volume.
(iii) Hydrogenation of ethene.
(iv) Decomposition of $NH_3$ on a hot Pt surface.
(v) Thermal decomposition of $SO_2Cl_2(g)$ at constant volume.
(i) Thermal decomposition of HI on gold surface.
(ii) Thermal decomposition of $N_2O_5(g)$ at constant volume.
(iii) Hydrogenation of ethene.
(iv) Decomposition of $NH_3$ on a hot Pt surface.
(v) Thermal decomposition of $SO_2Cl_2(g)$ at constant volume.
Updated On: Apr 4, 2025
- i, ii, iii
- i, iii, iv
- i, iv, v
- ii, iv, v
- ii, iii, v
Show Solution
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The Correct Option is D
Solution and Explanation
Choose the correct set of reactions which follow first order kinetics:
- Thermal decomposition of HI on gold surface.
- Thermal decomposition of \( N_2O_5(g) \) at constant volume.
- Hydrogenation of ethene.
- Decomposition of \( NH_3 \) on a hot Pt surface.
- Thermal decomposition of \( SO_2Cl_2(g) \) at constant volume.
Correct Answer: ii, iv, v
Explanation:
- (ii) \( N_2O_5 \) decomposition is a classic first-order reaction.
- (iv) Decomposition of ammonia on hot platinum follows first-order kinetics at low pressure (surface catalyzed reaction).
- (v) \( SO_2Cl_2 \) decomposition is known to be a first-order reaction.
Incorrect Options:
- (i) HI decomposition on gold surface does not strictly follow first-order kinetics—it depends on the surface and conditions.
- (iii) Hydrogenation of ethene is typically a surface reaction and doesn't show simple first-order behavior.
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