Question

Which of the following pairs is isomorphous

a) FeSO4 . 7H2O and CuSO4 . 5H2O b) FeSO4 . 7H2O and ZnSO4 . 7 H2O

c) FeSO4.7H2O and MnSO4 . 4H2O d) CuSO4. 5H2O and MnSO4 . 4H2O​

Answer 1

Question:

Which of the following pairs is isomorphous

a) FeSO₄ . 7H₂O and CuSO₄ . 5H₂O

b) FeSO₄ . 7H₂O and ZnSO₄ . 7 H₂O

c) FeSO₄.7H₂O and MnSO₄ . 4H₂O

d) CuSO₄. 5H₂O and MnSO₄ . 4H₂O​

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Answer and explanation:

What is an isomorphous substance?

Isomorphous substances usually have similar chemical formulas, and the polarizability and ratio of anion and cation radii are generally comparable

your answer is: FeSO₄ . 7H₂O and ZnSO₄ . 7 H₂O , because they have same degree of hydration viz. 7H2O molecules

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Answer 2

The pair which is isomorphous - $FeSO_{4}$ . 7$H_{2}O$ and  $ZnSO_{4}$ . 7$H_{2}O$ (Option b)

• Isomorphous pairs (iso – same, morphous – shape) are two or more substances with the same crystal structure, and the phenomenon is known as isomorphism.
• Here $FeSO_{4}$ . 7$H_{2}O$ and  $ZnSO_{4}$ . 7$H_{2}O$ will have the same crystal structures so they are isomorphous.
• Atoms which forms the structures are eventually same as oxygen, hydrogen, sulfur. The Fe and Zn also have some same properties and also belong to same d block elements.

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