Solid white compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps burn other things. The compound A is

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Calcium Carbonate

Potassium Chlorate

Calcium Chlorate

Calcium Chloride

answer is B.

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Detailed Solution

Solid white compound A decomposes quite rapidly on heating in the presence of a black substance X to form a solid compound B and a gas C. When an aqueous solution of compound B is reacted with silver nitrate solution, then a white precipitate of silver chloride is obtained along with potassium nitrate solution. Gas C does not burn itself but helps burn other things. The compound A is potassium chlorate.
Potassium chlorate is a white solid compound that decomposes quite rapidly on heating in the presence of manganese dioxide. Decomposition is facilitated by manganese dioxide. In the decomposition process, potassium chlorate is transformed into potassium chloride and oxygen gas. Therefore, compound A is potassium chlorate. Its reaction is given as