Metal compound A reacts with dilute HCl acid to produce effervescence. The gas evolved extinguishes a burning candle. If one of the compounds is calcium chloride, the chemical reaction is

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CaC O_{3} + 2 HCl \to CaC l_{2} + C O_{2}

None of the above

CaC O_{3} + 2 HCl \to CaC l_{2} + O_{2} + H_{2} O

CaC O_{3} + 2 HCl \to CaC l_{2} + C O_{2} + H_{2} O

answer is C.

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Detailed Solution

Metal compound A reacts with dilute HCl acid to produce effervescence. The gas evolved extinguishes a burning candle. If one of the compounds is calcium chloride, the chemical reaction is

CaC O_{3} + 2 HCl \to CaC l_{2} + C O_{2} + H_{2} O

.
The evolved gas produced effervescence, so it must be carbon dioxide. This also suggests that the given salt is carbonate salt. As one of the products is calcium chloride, so the reactant is calcium carbonate. The balanced chemical reaction equation is as follows:

CaC O_{3} + 2 HCl \to CaC l_{2} + C O_{2} ↑ + H_{2} O

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