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Question
Na2CO3.10H2O, when exposed to air, looses water of crystallization and finally gives:
Options:
A .  Na2CO3.4H2O
B .  Na2CO3.H2O
C .  Na2CO3.7H2O
D .  Na2CO3.9H2O
Answer: Option B
:
B
Na2CO3.10H2O is efflorescent and looses 9 water molecules on exposure to air to give Na2CO3.H2O.

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