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Chemical A reacts with dilute HCl to give effervescence and it is used to extinguish a candle. If one of the product is calcium chloride, then compound A is

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Ca (OH)_{2}

CaO

CaC O_{3}

$N a O H$

answer is A.

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Detailed Solution

$CaC O_{3}$ reacts with dilute HCl to give effervescence and it is used to extinguish a candle.

The gas evolves with effervescence and can extinguish fire; therefore, it should be $C O_{2}$ gas.

On the product side, one of the products formed is calcium chloride; it means that the substance on the reactant side is calcium carbonate.

Its reaction is given as
$CaC O_{3} + 2 HCl \to CaC l_{2} + C O_{2} + H_{2} O$

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