MHT CET 2025 Chemistry question

Which among the following salts turns red litmus blue in its aqueous solution?

(A)KCNCorrect
(B)
(C)NaCl
(D)KCl

Answer: (A)

Solution

A salt turns red litmus blue only if its aqueous solution is basic. KCN is the salt of a strong base (KOH) and a weak acid (HCN); the cyanide ion hydrolyses: , giving excess

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Question ID VK-101164