STANDARDChemistry-Chemical Equilibrium

STANDARD Chemistry Salt Hydrolysis MCQ Question

Type: MCQ-conceptual-Medium

NH₄CN is a salt of weak acid HCN (Kₐ = 6.2×10⁻¹⁰) and a weak base NH₄OH (K_b = 1.8 × 10⁻⁵). A one molar solution of NH₄CN will be

A

Neutral

B

strongly acidic

C

strongly basic

D

weakly basic

Correct Answer

Option D

Detailed Explanation

The solution will be basic if Kb>KaK_b > K_a. Here, Kb=1.8imes105K_b = 1.8 imes 10^{-5} and Ka=6.2imes1010K_a = 6.2 imes 10^{-10}. Since Kb>KaK_b > K_a, the solution is weakly basic.

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