In the closest packing of atom A of radius r_a, the radius of atom B that can be fitted in tetrahedral void is

0.225

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0.155 r_a

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0.414 r_a

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0.732 r_a

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Solution

The correct option is A
0.225

Limiting radius ratio of tetrahedral void = r_cation / r_anion = 0.225

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r_{a}

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