The white solid 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 to burn other things.
What is compound A?

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Solution

$2 K C l O_{3} A M n O_{2} (X) - ----- \to 2 K C l B + 3 O_{2} C$
When compound $B$ i.e. $K C l$ react with silver nitrate ( $A g N O_{3}$ ) then white ppt. of silver chloride is formed along with potssium nitrate solution.
$K C l + A g N O_{3} \to K N O_{3} + A g C l w h i t e p p t .$
Black substance X=Manganese dioxide
Gas $C$ i.e. oxygen $O_{2}$ does not burn but it is an essential component for burning.

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Q. The white solid 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 to burn other things.
What is the general name of substances like X?

Q. The white solid 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.
(a) What is compound A?
(b) What is compound B?
(c) What is gas C?
(d) What do you think is the black substance X? What is its function?
(e) What is the general name of substances like X?

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