Which of the following gas is liberated when red lead is heated with concentrated hydrochloric acid?

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SO₂

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H₂S

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Cl₂

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Solution

The correct option is D
Cl₂

Concentrated hydrochloric acid can readily be oxidized to chlorine by strong oxidizing agents such as manganese dioxide, lead dioxide, red lead etc. Alternatively, we can say that hydrochloric acid readily reduces these compounds.

$M n O_{2} + 4 H C l \to M n C l_{2} + 2 H_{2} O + C l_{2} P b O_{2} + 4 H C l \to P b C l_{2} + 2 H_{2} O + C l_{2} P b_{3} O_{4} + 8 H C l \to 3 P b C l_{2} + 4 H_{2} O + C l_{2}$

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