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Q80) The sulphate of metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is .... [ IIT 1991]


isomorphous represent same molecular formula and same structure
∴ formula MSO4.7H2O
Let m be the atomic weight of metal M, molecular weight of formula is=m+ 32+4×16 + 7(18)
molecular weight=m + 222
given % of metal=9.87%
From formula of % of metal
Answer: (c)