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Q.

Which of the following is the compound A for the given observation?

Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. The compound formed is calcium chloride.

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a

Calcium oxide

b

Calcium hydroxide

c

Calcium carbonate

d

None of the above

answer is C.

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Detailed Solution

The compound A for the given observation is Calcium carbonate.
Metal carbonate A is calcium carbonate as when it reacts with dilute

HCl

, the products formed are calcium chloride (salt), water and carbon dioxide.
Carbonates react with acid to form carbon dioxide gas to extinguish the fire. It is stated that one of the compounds formed is calcium chloride so metal compound A can be calcium carbonate. The reaction is given as,

CaC O_{3} (s) + 2 HCl (aq) \to CaC l_{2} (aq) + H_{2} O (l) + C O_{2} (g) .

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