Multiple choice

A desiccant induces a state of dryness. Among the following, ------------------- is used as a desiccant.

  1. Calcium cyanamide

  2. Calcium fluoride

  3. Calcium hydride

  4. Calcium hydroxide
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C Correct answer
Explanation

Calcium hydride is the chemical compound with the formula CaH2. This grey powder (white if pure, which is rare) reacts vigorously with water liberating hydrogen gas. CaH2 is thus used as a drying agent, i.e. a desiccant.

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