Question

While preparing ${\mathrm{CO}}_2$ in laboratory on which of the following substances hydrochloride acid is poured?

• A. Pieces of Zinc
• B. The practices of copper Sulphur
• C. Pieces of marble
• D. Ammonium Chloride

Answer 1

The correct option is C

Pieces of marble

Carbon dioxide (${\mathrm{CO}}_2$) is a gas that can be prepared in the laboratory by the action of Hydrochloric acid ($\mathrm{HCl}$) on Calcium carbonate (${\mathrm{CaCO}}_3$) or the pieces of marble.

Explanation for the correct option:

(C) Pieces of marble: When Hydrochloric acid ($\mathrm{HCl}$) is poured over the Pieces of marble or Calcium carbonate (${\mathrm{CaCO}}_3$) then there is evolution of Carbon dioxide (${\mathrm{CO}}_2$). The reaction is given below:

$\underset{\mathrm{Calcium}\mathrm{carbonate}}{{\mathrm{CaCO}}_3\left(\mathrm{s}\right)}+\underset{\mathrm{Hydrochloric}\mathrm{acid}}{2\mathrm{HCl}\left(\mathrm{l}\right)}\to \underset{\mathrm{Calcium}\mathrm{chloride}}{{\mathrm{CaCl}}_2\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}+\underset{\mathrm{Carbon}\mathrm{dioxide}}{{\mathrm{CO}}_2\left(\mathrm{g}\right)}$

Explanation for the incorrect option:

We cannot prepare Carbon dioxide (${\mathrm{CO}}_2$) by pouring Hydrochloric acid ($\mathrm{HCl}$) on the Pieces of Zinc ($\mathrm{Zn}$), practices of copper Sulphur (${\mathrm{CuSO}}_4$ and Ammonium Chloride (${\mathrm{NH}}_4\mathrm{Cl}$ because there is absence of Carbonate ($C{O_3}^{-}$) ion in each case.

Therefore, the correct option is (C).