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Washing soda on standing in air efflores...

Washing soda on standing in air effloresced. How many water molecules are lost ?

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The correct Answer is:
`(9)`
`underset("Washing soda")(Na_(2)CO_(3).10H_(2)O)` `underset("Monohydrate")(Na_(2)CO_(3).H_(2)O)`
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