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प्रश्न
Describe a test (other than electrolysis) to prove that hydrochloric acid contains chlorine gas.
लघु उत्तर
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उत्तर
Test: Heat concentrated hydrochloric acid with a strong oxidizing agent like Manganese dioxide (MnO2).
Observation: A greenish-yellow gas with a pungent, choking smell is evolved. When a moist starch-iodide paper is brought near it, the paper turns blue-black, proving the gas is Chlorine.
Equation: \[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2 ^}\]
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