AIPMT MAINS2009Chemistry-Chemical Kinetics
AIPMT MAINS 2009 Chemistry Rate of Reaction MCQ Question
Type: MCQ-numerical-Medium-Class 12
For the reaction N₂ + 3H₂ → 2NH₃, if (d[NH₃]/dt = 2 × 10⁻⁴ mol L⁻¹ s⁻¹, the value of (-d[H₂]/dt would be :
A
4 × 10⁻⁴ mol L⁻¹ s⁻¹
B
6 × 10⁻⁴ mol L⁻¹ s⁻¹
C
1 × 10⁻⁴ mol L⁻¹ s⁻¹
D
3 × 10⁻⁴ mol L⁻¹ s⁻¹
Correct Answer
Option D
Detailed Explanation
The rate of disappearance of H₂ is three times the rate of formation of NH₃ because of the stoichiometry of the reaction. Therefore, (-d[H₂]/dt) = 3 × (d[NH₃]/dt) = 3 × 2 × 10⁻⁴ = 6 × 10⁻⁴ mol L⁻¹ s⁻¹.
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