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Q.

A hydrate of Na₂SO₃ has 50% water by mass. It is

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a

Na₂SO₃.6H₂O

b

Na₂SO₃.5H₂O

c

Na₂SO₃.2H₂O

d

Na₂SO₃.7H₂O

answer is C.

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Detailed Solution

Na₂SO₃:H₂O $\equiv 50 : 50$ (Mw of Na₂SO₃=126)

Mole : $\frac{50}{126} : \frac{50}{18}$

Ratio : 1:7

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