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  4. Assertion: bcc and hcp has same packing efficiency. Reason: Both have same number of atoms per unit cell and same arrangement.

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Q. Assertion: $bcc$ and $hcp$ has same packing efficiency.
Reason: Both have same number of atoms per unit cell and same arrangement.

AIIMSAIIMS 2011The Solid State

Solution:

BCC has 68% and HCP has 74% packing efficiency.

BCC - 2 atoms per unit cell, HCP - 4 atoms per unit cell

In BCC, particles are present at corners and one particle is present at the centre within the body of the unit cell. In HCP, the packing gives a hexagonal pattern.