Q144 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Medium

In the ccp packing, the number of lattice points per unit area in the planes is in the order

(a)$(100)>(110)>(111)$

(b)$(100)>(111)>(110)$

(c)$(111)>(100)>(110)$

(d)$(111)>(110)>(100)$

Answer

Answer: C ✓ checked by 4AB · confidence high

Explanation

Planar densities in ccp: (111) 4/(√3a²) = 2.31/a² > (100) 2/a² > (110) 2/(√2a²) = 1.41/a².

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