An inorganic salt when heated with concentrated evolves a colorless pungent-smelling gas. However, when the same salt is heated with a mixture of concentrated and , it evolves a colored pungent-smelli

Question

An inorganic salt when heated with concentrated $H_2SO_4$ evolves a colorless pungent-smelling gas. However, when the same salt is heated with a mixture of concentrated $H_2SO_4$ and $MnO_2$, it evolves a colored pungent-smelling gas that bleaches moist litmus paper. The colored gas is:

Prashant Kotian · Accepted Answer

Correct answer: B. The salt is a chloride. Heating a chloride salt with concentrated yields , a colorless pungent gas. When (an oxidizing agent) is added along with , the formed is oxidized to chlorine gas (). Chlorine is a yellowish-green, pungent-smelling gas that effectively bleaches moist litmus paper via oxidation. , and do not bleach litmus paper in this characteristic manner.

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