Statement 1: Both hcp and ccp are equally efficient.
Statement 2: Packing efficiency of hcp is 74%.

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Both statements 1 and 2 are correct

Both statements 1 and 2 are incorrect

Statement 1 is incorrect and statement 2 is correct

Statement 1 is correct and statement 2 is incorrect

answer is A.

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Detailed Solution

Both hcp and ccp are equally efficient. Packing efficiency of hcp and ccp is
$\begin{array}{l} PE = \frac{4 \times (4 / 3) {πr}^{3} \times 100}{(2 \sqrt{2} r)^{3}} % \\ = \frac{(16 / 3) {πr}^{3} \times 100}{16 \sqrt{2} r^{3}} % = 74 % \end{array}$

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