The black powder which gives greenish yellow gas when heated with conc. hydrochloric acid is :

cuprous oxide

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coal

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lead oxide

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manganese dioxide

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Solution

The correct option is D manganese dioxide
Manganese dioxide when heated with conc. HCl gives a greenish-yellow gas. This gas produced is chlorine gas.

${M n O}_{2} + 4 H C l H e a t - -- \to M n {C l}_{2} + 2 H_{2} O + {C l}_{2 (g)} c o n c .$

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The black powder which gives greenish yellow gas when heated with conc. hydrochloric acid is :

The correct option is D manganese dioxideManganese dioxide when heated with conc. HCl gives a greenish-yellow gas. This gas produced is chlorine gas.MnO2+4HClHeat−−−→MnCl2+2H2O+Cl2(g)conc.

The correct option is D manganese dioxide
Manganese dioxide when heated with conc. HCl gives a greenish-yellow gas. This gas produced is chlorine gas.

${M n O}_{2} + 4 H C l H e a t - -- \to M n {C l}_{2} + 2 H_{2} O + {C l}_{2 (g)} c o n c .$