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  • Assertion (A): Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four.

In the following questions, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.
(a) Assertion and Reason both are correct statements and Reason is the correct explanation for Assertion.
(b) Assertion and Reason both are correct statements but Reason is not the correct explanation for Assertion.
(c) Assertion is correct but Reason is wrong.
(d) Assertion is wrong but Reason is correct.

Assertion (A): Total number of octahedral voids present in unit cell of cubic close packing including the one that is present at the body centre, is four.

Reason (R): Besides the body centre, there is one octahedral void present at the centre of each of the six faces of the unit cell and each of which is shared between two adjacent unit cells.

Answers (1)

The answer is the option (c)(c) Assertion is correct but Reason is wrong.

 There are 12 octahedral voids at the edge centre and 1 in the body centre.
So total number of octahedral voids present in unit cell of cubic close packing = 12 \times \frac{1}{2} +1 = 4

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