Question

Which of the following is used as a drying agent:-

• A. Washing soda
• B. Glauber's salt
• C. Sulphuric acid
• D. Blue vitriol

Answer 1

The correct option is C

Sulphuric acid

Sulphuric acid $\left(H_{2}S{O}_4\right)$ is used as a drying agent because it absorbs moisture from other substances without even chemically reacting with them.

Glauber's Salt $(N{a}_{2}S{O}_4.10H_{2}O)$, Blue vitriol $\left(CuS{O}_4.5H_{2}O\right)$ and washing soda $\left(N{a}_{2}C{O}_3.10H_{2}O\right)$ are efflorescent substances which lose water of crystallisation when exposed to air.