Question

Fill in the blanks. Metals react with acids to produce ____________ gas.

Answer 1

Reaction of metals with acid:

• When an acid reacts with metal, salt and hydrogen gas are produced.
• Example: Zinc powder($\mathrm{Zn}$) reacts with Hydrochloric acid ($\mathrm{HCl}$) that releases ${\mathrm{H}}_2$ gas and Zinc chloride (${\mathrm{ZnCl}}_2$).
• The reaction proceeds as follows:

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

Thus, metals react with acids to produce hydrogen gas.