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AIIMS 2011
Exam
AIIMS
Year
2011
Subject
Chemistry
Chapter
Solid State

AIIMS 2011 · Chemistry · Solid State

Assertion : b c c and h c p has same packing efficiency. Reason :...

Assertion : bccb c c and hcph c p has same packing efficiency. Reason : Both have same number of atoms per unit cell and same arrangement.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

D. If both assertion and reason are false.

Step-by-step solution

bcc has 68%68 \% and hcph c p has 74%74 \% packing efficiency. bccb c c - 2 atoms per unit cell, hcp−4h c p-4 atoms per unit cell In bccb c c, 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.
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