Q93 · CSIR NET Chemistry, June 2013
Paper: CSIR NET June 2013 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Easy
The coordinates for the atoms in a body centred cubic unit cell are
(a)(0, 0, 0) and (1/2, 0, 0)
(b)$(0,0,0)$ and $(1 / 2,1 / 2,1 / 2)$
(c)(0, 0, 0) and (0, 1/2, 0)
(d)(0, 0, 0) and (0, 0, 1/2)
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed C; on checking, B is correct — see the explanation.
Printed C (0,½,0) is a face-edge point, not the body centre.
Explanation
Body-centred cubic: lattice points at (0,0,0) and the body centre (½,½,½).
Study loop for Solid State Chemistry