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Question

Assertion :In rock salt structure, all the octahedral voids in the close packing of anions are occupied by cations. Reason: In rock salt structure, the distance of closest approach between two anions is equal to half the face diagonal of the unit cell.

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
Assertion is incorrect but Reason is correct
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In rock salt structure, all the octahedral voids in the close packing of anions are occupied by cations.
In rock salt structure, the distance of closest approach between two anions is equal to half the face diagonal of the unit cell i.e. 2a2=(r++ r)

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