Question

_____ is a colorless gas that is produced by the reaction of active metal with dilute Hydrochloric acid.

Answer 1

Hydrogen gas is released:

1. Hydrogen gas is produced by active metals in reaction with dilute Hydrochloric acid.
2. When a metal reacts with an acid, it forms hydrogen gas and salt.
3. For example the reaction of zinc with Hydrochloric acid:

$\underset{\mathrm{Zinc}}{\mathrm{Zn}\left(\mathrm{s}\right)}+\underset{\mathrm{Hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{l}\right)}\to \underset{\mathrm{Zinc}\mathrm{chloride}}{{\mathrm{ZnCl}}_2\left(\mathrm{aq}\right)}+\underset{\mathrm{Hydrogen}\mathrm{gas}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}$

Therefore, hydrogen is a colorless gas that is produced by the reaction of active metal with dilute Hydrochloric acid.