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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 20g of the crystals will be

$\begin{array}{1 1}(a)\;45.3g& (b)\;4.53g \\(c)\;0.453g&(d)\;453g\end{array} $

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