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can a cation ...

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can a cation of less than 0.155 R of anion placed in triangular void??

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Q. Assertion: The size of a cation is larger in tetrahedral void than in octahedral void.
Reason: Cations occupy more space than anions is crystal packing.

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C a F_{2}

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(a) Rock salt	(p) Face-centred cubic, anion in tetrahedral void	(w) 6
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