Assertion :The number of tetrahedral voids is double the number of octahedral voids. Reason: The size of the tetrahedral voids is half of that of the octahedral void.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is C Assertion is correct but Reason is incorrect The number of tetrahedral voids is double the number of octahedral voids. Thus, in fcc unit cell, there are 4 octahedral and 8 tetrahedral voids. The size of tetrahedral voids is smaller but not half of that of the octahedral voids.