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Chemistry Solid State NCERT Single Correct MCQ
Published on: August 11, 2026

Assertion: bcc and hcp has same packing efficiency.

Reason: Both have same number of atoms per unit cell and same arrangement.

A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not the correct explanation of A.
C
A is true but R is false.
D
Both A and R are false.

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Text Solution

Verified by Experts
The correct answer is:
D

bcc has 68% and hcp has 74% packing efficiency, bcc ‐ 2 atoms/unit cell; hcp ‐ 4 atoms/unit cell. In bcc particles are present at corners and one particles is present at the centre within the body of the unit cell. In hcp the packing gives a hexagonal pattern.

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