Assertion (A) The packing efficiency of hcp and fcc arrangement is equal. Reason (R) In hcp packing each sphere is surrounded by twelve other spheres.

Question

Assertion (A) The packing efficiency of hcp and fcc arrangement is equal. Reason (R) In hcp packing each sphere is surrounded by twelve other spheres. (A) Both A and R are correct; R is the correct explanation of A. (B) Both A and R are correct; R is not the correct explanation of A. (C) A is correct; R is incorrect. (D) R is correct; A is incorrect.

Tardigrade Admin · Accepted Answer

In hcp as well as ccp packing each sphere is surrounded by twelve other spheres. Thus, the packing efficiency of hcp and fcc arrangement is equal.

Q. Assertion (A) The packing efficiency of hcp and $f cc$ arrangement is equal.
Reason (R) In hcp packing each sphere is surrounded by twelve other spheres.

Both $A$ and $R$ are correct; $R$ is the correct explanation of $A$ .

Both $A$ and $R$ are correct; $R$ is not the correct explanation of $A$ .

$A$ is correct; $R$ is incorrect.

$R$ is correct; $A$ is incorrect.

In $h c p$ as well as $cc p$ packing each sphere is surrounded by twelve other spheres. Thus, the packing efficiency of hcp and $f cc$ arrangement is equal.

Q. Assertion (A) The packing efficiency of hcp and fcc arrangement is equal. Reason (R) In hcp packing each sphere is surrounded by twelve other spheres.

Both A and R are correct; R is the correct explanation of A.

Both A and R are correct; R is not the correct explanation of A.

A is correct; R is incorrect.

R is correct; A is incorrect.