Q48 · CSIR-NET Chemistry, December 2012

Paper: CSIR-NET December 2012 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Coordination Chemistry – General · Marks: 2 · Difficulty: Easy

Coordination number of " C " in $\mathrm{Be}_{2} \mathrm{C}_{3}$ whose structure is correlated with that of $\mathrm{CaF}_{2}$ is:
(a)2
(b)4
(c)6
(d)8
Answer
Answer: D ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation
Be₂C has the antifluorite structure: Be²⁺ in all tetrahedral holes of a cubic close-packed C⁴⁻ array, so each carbon is surrounded by eight Be — coordination number 8.

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