Question

Sample Problem 1. Metal compound A reacts with dilute hydrochloric acid to produce effervescence.
The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one
of the compounds formed is calcium chloride.
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(NCERT Book Question)
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Answer 1

Explanation:

answer for you by sherin

Answer 2

ANSWER

When a metal compound A on reacting with hydrochloric acid shows effervescence which shows the evolution of carbon dioxide gas and it is confirmed by putting off the candle flame.  

So metal compound A is a carbonate of calcium which on reacting with HCl gives calcium chloride and carbon dioxide as gas along with water.

$CaCO_3 (s) + 2HCl(aq) > CaCl_2 (s) + CO_2 (g) + H_2 O(l)$

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