(a) What happens when an acid reacts with a metal? Give the chemical equation of the reaction involved.

(b) Which gas is usually liberated when an acid reacts with a metal?

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Solution

(a) Those metals which are above hydrogen in metal reactivity series will liberate hydrogen gas along with ormation of a salt on reaction with dil. acids.
$M e t a l + A c i d ⟶ S a l t + H y d r o g e n$
Eg. Zinc with sulphuric acid.

When zinc react with dilute sulphuric acid, zinc sulpate and hydrogen gas are produced.
$Z n (s) + H_{2} S O_{4} (a q) ⟶ Z n S O_{4} (a q) + H_{2} (g)$

(b) Hydrogen gas is usually liberated when an acid reacts with a metal.

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