Assertion : Hexagonal close packing is more closely packed than cubic close packing.
Reason : Hexagonal close packing has a coordination number of 12 whereas cubic close packing has a coordination number of 8.

Options

A. If both (A) and ( R) are correct and ( R) is the correct explanation of(A).
B. If both (A) and ( R) are correct, but ( R) is not the correct explanation of (A).
C. If (A) is correct, but ( R) is incorrect.
D. If both (A) and ( R) are incorrect.

Answer

D

Explanation

Hexagonal close packing and cubic close packing are equally close packed (space occupied=74%). Both have a coordination number of 12.