Redox and Equivalent ConceptHard
Question
A metal (M) forms a hydrated sulphate, isomorphous with ZnSO4⋅7H2O. If the sulphate contains 20% metal, by weight, which of the following is/are correct for the metal?
Options
A.The atomic weight of metal is 24.
B.The equivalent weight of the metal is 27.75.
C.The metal is bivalent.
D.The anhydrous metal sulphate contains 36.6% metal, by mass.
Solution
The chemical formula of sulphate is MSO4.7H2O.
$(A + 222) \times \frac{20}{100} = A \Rightarrow A = 55.5$
As the valency of metal is 2, the equivalent weight $= \frac{55.5}{2} = 27.75$
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