Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): The packing effieciency is maximum for fcc structure.
Reason (R): The coordination number is $12$ in the fcc structure.

Both A and R are true and R is the correct explanation of A

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Both A and R are true but R is not the correct explanation of A

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A is true but R is false

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A is false but R is true

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Solution

The correct option is B Both A and R are true but R is not the correct explanation of A
Assertion and Reason both are correct statements but reason is not the correct explanation of assertion.
Packing efficiency is maximum for fcc structure because it consists of total four atoms per unit cell. Packing efficiency is maximum in fcc structure which is equal to $74 %$ .

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Similar questions

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.

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(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) The packing efficiency is maximum for the fcc structure.

Reason (R) The coordination number is 12 in fcc structures.

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Given below are two statements labelled as Assertion (A) and Reason (R). Assertion (A): The packing effieciency is maximum for fcc structure. Reason (R): The coordination number is 12 in the fcc structure.

Given below are two statements labelled as Assertion (A) and Reason (R).
Assertion (A): The packing effieciency is maximum for fcc structure.
Reason (R): The coordination number is $12$ in the fcc structure.