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On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals,…

On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO₄. yH₂O. The value of y is?
(Mg = 24, S = 32, O = 16, H = 1)

A.
1
B.
3
C.
5
D.
7

Correct Answer: Option D

Explanation

MgSO₄. YH₂O
120g (MgSo₄) contains – 18g (water)
20g contain (41 – 20g) water.
120g → 18 y; 20 → 21
∴ 18 y = (126)/(18) = 7