Question

Dilute hydrochloric acid is added to granula zinc taken in a test tube. The following observations are recorded. Point out the correct observation.

• A. The surface of metal becomes shining
• B. The reaction mixture turns milky
• C. Odour of a pungent smelling gas is recorded
• D. A colourless and odourless gas is evolved

Answer 1

The correct option is D

A colourless and odourless gas is evolved

The explanation for the correct option

(D)

• $\underset{\mathrm{Zinc}}{\mathrm{Zn}\left(\mathrm{s}\right)}+\underset{\mathrm{Acid}}{\underset{\mathrm{Hydrochloric}}{2\mathrm{HCl}\left(\mathrm{aq}\right)}}\to \underset{\mathrm{Chloride}}{\underset{\mathrm{Zinc}}{{\mathrm{ZnCl}}_2\left(\mathrm{aq}\right)}}+\underset{\mathrm{Gas}}{\underset{\mathrm{Hydrogen}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}}$
• A colorless and odorless gas is produced with bubbles.
• The gas evolved is hydrogen

Thus, the correct answer is an option (D)