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Q.

When crystals of washing soda are exposed to the air, it undergoes which process?

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a

Evaporation

b

Crystallization

c

Efflorescence

d

Centrifugation

answer is C.

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Detailed Solution

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When crystals of washing soda are exposed to the air, it undergoes an efflorescence process.
Efflorescence is the process in which molecules of water of crystallisation is lost when the substance is exposed to air. When crystals of washing soda are exposed to the air, it forms white powder of washing soda and its reaction is given as

N a_{2} C O_{3} . 10 H_{2} O \to N a_{2} C O_{3} . H_{2} O + 9 H_{2} O

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