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Question

Given: Radius of A2+ = 100 pm; Radius of C+ = 240 pm; Radius of B2 = 300 pm; Radius of D = 480 pm. Which is/are correct statement?

A
The coordination number of A2+ in compound AB is 4.
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B
The coordination number of A2+ in compound AB is 6.
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C
The coordination number of C+ in compound CD is 6.
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D
The coordination number of C+ in compound CD is 8.
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Solution

The correct option is C The coordination number of C+ in compound CD is 6.
Radius ratio = r+r
In AB, radius ratio = 0.33, the cation sits in the tetrahedral void, coordination number is 4.
In CD, radius ratio = 0.5, the cation sits in the octahedral void, coordination number is 6.

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