Question

Assertion (A): Hexagonal close packing is more closely packed than cubic close packing.

Reason (R): Hexagonal close-packing has a coordination number 12 whereas the cubic close packing has a coordination number 8.

(a) If both assertion and reason are true and the reason is the correct explanation of assertion.

(b) If both assertion and reason are true, and the reason is not the correct explanation of assertion.

(c) If the assertion is true but the reason is false.

(d) If both assertion and reason are false.

Answer 1

(d) If both assertion and reason are false.

Correct assertion: Hexagonal close packing and cubic close packing are equally close-packed with a packing efficiency of 74%.

Correct reason: Both have the coordination number 12.