Assertion :In fluorite structure, the $F^{-}$ ions occupy tetrahedral voids and $C a^{2 +}$ ions form ccp. Reason: The radius ratio of fluorite structure is $0.414$ .

Read the above assertion and reason and choose the correct option regarding it.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In flourite structure, the $F^{-}$ ions occupy tetrahedral voids and $C a^{2 +}$ ions form cubic closed packing. Each $C a^{2 +}$ is surrounded by $8 F^{-}$ ions and it has a co-ordination number of $8$ whereas each $F^{-}$ ion is surrounded by $4 C a^{2 +}$ ions and it has a co-ordination number of $4$ . Thus, this structure has $8 : 4$ co-ordination. The radius ratio of fluorite structure is usually more than $0.732$ .

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Assertion :In fluorite structure, the F− ions occupy tetrahedral voids and Ca2+ ions form ccp. Reason: The radius ratio of fluorite structure is 0.414.Read the above assertion and reason and choose the correct option regarding it.

Assertion :In fluorite structure, the $F^{-}$ ions occupy tetrahedral voids and $C a^{2 +}$ ions form ccp. Reason: The radius ratio of fluorite structure is $0.414$ .

Read the above assertion and reason and choose the correct option regarding it.