If the anion (A) forms hexagonal closest packing and cation (C) occupies only 23rd of octahedral voids in it, what will be the general formula of the compound?
A
CA
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B
CA2
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C
C2A3
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D
C3A2
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Solution
The correct option is CC2A3 In hexagonal closed packing, there are 6 octahedral voids completely inside the unit cell. No. of atoms in hexagonal close packing =6
Since, anions (A) forms hexagonal lattice No. of A atoms =6
Cation 'C' occupies 23 of the octahedral voids in the unit cell. ∴No. of C atoms =6×23=4 ∴ Emperical formula of the compound =C4A6orC2A3