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Q.

The crystalline slat Na2SO4·xH2O on heating loses 55.9 % of its weight. The formula of crystalline salt is ___?

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a

Na2SO4·5H2O

b

Na2SO4·7H2O

c

Na2SO4·2H2O

d

Na2SO4.10H2O

answer is D.

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Detailed Solution

As Na2SO4·xH2O on heating loses water, i.e., 55.9 % ≈56%of its weight.∴% of weight of Na2SO4=44%  Molecular weight of Na2SO4=142 g ∴wH2OwNa2SO4=5644orWH2O=5644×142=180 g  Thus, the formula of crystalline salt is Na2SO4,10H2O .
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