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Question

An efflorescent crystal.
  1. Water
  2. Calcium oxide
  3. Hydrogen
  4. Washing soda

A
Washing soda
B
Hydrogen
C
Water
D
Calcium oxide
Solution
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C. Washing soda or sodium carbonate
An efflorescent substance is a chemical which has water associated with its molecules, and which, when exposed to air loses its water through evaporation. Sodium carbonate is formed as mineral-rich water rises to the surface through capillary action and then evaporates e.g. gypsum, vitriol, washing soda.

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