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The decahydrate form of sodium carbonate i.e. washing soda on standing in air effloresces and crumbles to powder. The number of water molecule(s) present in the compound formed is:

Correct answer

1

Step-by-step solution

Hydrated crystals of sodium carbonate exposed to air it losses it is 9 molecules of water of crystallization leaving only powder sodium carbonate with one molecule of water The process of losing water of crystallization is called efflorescence N a 2 C O 3 . 10 H 2 O s d e c a h y d r a t e → e f f l o r e s c e s - 9 H 2 O N a 2 C O 3 . H 2 O s m o n o h y d r a t e

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