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Q.

Which gas is produced when dilute hydrochloric acid is added to a reactive metal?


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a

Hydrogen gas

b

Nitrogen gas

c

Carbon dioxide gas

d

Helium gas  

answer is A.

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Detailed Solution

Hydrogen gas is produced when dilute hydrochloric acid is added to a reactive metal.
When a reactive metal is reacted with dilute hydrochloric acid, the corresponding metal salt is produced along with the liberation of hydrogen gas. For example, the reaction of sodium with hydrochloric acid is given as
2Na+2HCl → 2NaCl+H2
 
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