AIPMT PRELIMS2009Chemistry-Chemical Equilibrium
AIPMT PRELIMS 2009 Chemistry Equilibrium Constant MCQ Question
Type: MCQ-numerical-Medium-Class 11
The dissociation constants for acetic acid and HCN at 25°C are 1.5 × 10⁻⁵ and 4.5 × 10⁻¹⁰ respectively. The equilibrium constant for the equilibrium
CN⁻ + CH₃COOH ⇌ HCN + CH₃COO⁻ would be:
A
3.0 × 10⁻⁵
B
3.0 × 10⁻⁴
C
3.0 × 10⁴
D
3.0 × 10⁵
Correct Answer
Option C
Detailed Explanation
The equilibrium constant Kₐ for CN⁻ + CH₃COOH ⇌ CH₃COO⁻ + HCN is calculated as 1.5 × 10⁻⁵ / 4.5 × 10⁻¹⁰ = 3.33 × 10⁴.
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