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Q)

# $NH_4OH$ is a weak base but it becomes still weaker in the aqueous solution of

(a) 0.1 M $HCl$

(b) 0.1 M $NH_4Cl$

(c) 0.1 M $H_2SO_4$

(d) 0.1 M $CH_3COOH$

Answer: 0.1 M $NH_4Cl$
Hence, Degree of Ionisation of $NH_4OH$ is suppressed by $NH_4Cl$ due to common ion effect.