**Question:** The sulphate of a metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO₄.7H₂O. The atomic weight of M is [IIT 1991]

(a) 40.3

(b) 36.3

(c) 24.3

(d) 11.3

**Correct Answer:** (c) 24.3

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