An efflorescent crystal.

Water

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Calcium oxide

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Hydrogen

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Washing soda

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Solution

The correct option is D Washing soda
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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Similar questions

Match the statements in column A with that in column B.

Column A Column B

(a) deliquescent substance (i)sodium bicarbonate

(b) hydroscopic substance (ii) magnesium chloride

(d) substance causing temporary (iv) washing soda hardness

Which of the following is an example of efflorescent substance?

Give reasons for the following

1. Heating hydrated copper sulphate crystal is deemed a chemical change.

2. Efflorescence is minimum during humid conditions.

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