Which of the following compounds are not isomorphous?
a. Copper sulphate and zine sulphate
b. Zinc sulphate and manganeous sulphate
c. Calcium carbonte and ferrous sulphate d. Zine sulphate and ferrous sulphate

Explanation

`(a, c)`
a. `CuSO_(4)*5H_(2)O` and `ZnSO_(4)*7H_(2)O` are not ismorphous.
Different moles of `H_(2)O`.
b. `ZnSO_(4)*7H_(2)O` and `MnSO_(4)*7H_(2)O` are isomorphous with `7H_(2)O` in both compounds.
c. `CaCO_(3)` and `FeSO_(4)*7H_(2)O` are not isomorphous, since the moles of `H_(2)O` are not same.
d. `ZnSO_(4)*7H_(2)O` and `FeSO_(4)*7H_(2)O` are isomorphous with same number of moles `H_(2)O`.