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Q.

Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be

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a

45.3 g

b

4.53 g

c

0.453 g

d

453 g

answer is B.

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Detailed Solution

100 g of ZnSO4 crystals are obtained from = 22.65 g Zn1 g of ZnSO4 crystals will be obtained from = 22.65100  gm of Zn20gm  of ZnSO4 crystals  obtained from = 22.65100×20=4.53g
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