Why a reaction of a metal with acid liberates gases. And how do we detect them?

Why a reaction of a metal with acid liberates gases. And how do we detect them?

Page 22 Question 2

Acids in a solution form H+ ion. Metals are electron donor; they donate electrons to H+.  Addition of electron to  H+ forms a hydrogen molecule. The hydrogen molecule is a gas and does not dissolve in water. This gas escapes out.

Activity 2.2 Class 10 science zinc granule reaction with acid
Zinc granule reaction with acid

HA(Acid) (in aqueous medium)—-> H+ + A

M —-> M+ + e

2H+ + 2e —> H2(gas)

Hydrogen gas (H2) is an inflammable gas, when we bring this gas to a burner it burns spontaneously.

Next: A metal compound which reacts with acid and extinguishes the fire.

See also: Why we do not keep curd and sour substances in Brass container.

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