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Question
What is the action of conc. sulphuric acid on potassium chloride?
Short Answer
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Solution
When solid potassium chloride (KCl) is heated with concentrated sulphuric acid below 200°C, it forms potassium hydrogen sulphate and evolves pungent hydrogen chloride (HCl) gas.
\[\ce{KCl + H2SO4 (conc.) ->[< 200°C] KHSO4 + HCl ^}\]
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