A white crystalline salt imparts a violet colour to a Bunsen flame, and with hot concentrated H2SO4, forms a pungent gas. On treatment with an AgNO3 solution, this gas forms a white precipitate readil

Question

A white crystalline salt imparts a violet colour to a Bunsen flame, and with hot concentrated H2SO4, forms a pungent gas. On treatment with an AgNO3 solution, this gas forms a white precipitate readily soluble in NH3. The white crystalline salt may be:

Prashant Kotian · Accepted Answer

Correct answer: B. Step 1: The violet flame test is characteristic of potassium (K+) ions. Step 2: Reacting with hot concentrated H2SO4, chloride salts release hydrogen chloride (HCl) gas, which has a pungent odor and reacts with silver nitrate (AgNO3) to form a white precipitate of AgCl that dissolves in ammonia. Step 3: Combining potassium and chloride, the salt is potassium chloride (KCl), matching option (b).

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