Question

Sulphuric acid is used as a drying and dehydrating agent.

• A. True
• B. False

Answer 1

The correct option is A True

1. conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ removes $\mathrm{H}\mathrm{and}\mathrm{O}$ atoms from sugar.
2. e.g. $$\begin{gathered} {\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\left(\mathrm{s}\right)\stackrel{\mathrm{conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }6\mathrm{C}\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right) \\ \mathrm{Sugar}\mathrm{Carbon}+\mathrm{water} \end{gathered}$$. this is dehydrating nature of sulphuric acid.
3. conc. ${\mathrm{H}}_2{\mathrm{SO}}_4$ removes water molecules to dry gaseous molecules.
4. e.g.$$\begin{gathered} {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}\left(\mathrm{aq}\right)\stackrel{\mathrm{conc}.{\mathrm{H}}_2{\mathrm{SO}}_4}{\to }{\mathrm{C}}_2{\mathrm{H}}_4\left(\mathrm{g}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right) \\ \mathrm{Ethyl}\mathrm{Alcohol}\mathrm{Ethyne}+\mathrm{water} \end{gathered}$$

Therefore, the given statement is true.