Question

Assertion :It occupies certain holes of this type but not the other holes of the same type? Reason: The proximity of two cations $\left(A^{2+}and{B}^{4+}\right)$ would be electrostatically unfavourable.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The structure is perovskite structure. It is a network of corner linked oxygen octahedra, the smaller, $B^{4+}$, filling the octahedral sites and the larger $A^{2+}$ cations filling the dodecahedral sites. Two $A^{2+}$ ion and $O^{2-}$ constitute the diagonal of the cube. Two $O^{2-}$ and $B^{4+}$ ion constitute face of a cube.