A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is:
A
C2A3
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B
C3A2
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C
C3A4
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D
C4A3
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Solution
The correct option is CC3A4 Anions(A)areinhcp,sothenumberofanions(A)=6Cations(C)arein75%ofoctahedralvoids,sothenumberofcations(C)=6×34=184=92SotheformulaofthecompoundwillbeC9/2A6⇒C9A12⇒C3A4