Q62 · CSIR-NET Chemistry, December 2018

Paper: CSIR-NET December 2018 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Medium

In a cubic crystal, the (111) and (222) reflections are observed, but not the (001) reflection. The Bravais lattice is

(a)body centred cubic

(b)face centred cubic

(c)simple cubic

(d)side centred cubic

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

(111) and (222) present but (001) absent: the fcc condition (h, k, l unmixed) — a bcc lattice would forbid (111).

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