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Column-I Column-II
A) 50% ‘Tetrahedral’ voids filled p) CsCl
B) 100% ‘octahedral’ voids q) NaCl
C) 100% ‘Tetrahedral’ voids filled r) ZnS
D) No ‘Tetrahedral’ voids present s) Na₂O
(A) (B) (C) (D)
1) r q s p
2) p r q s
3) p q r s
4) s r q p

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answer is A.

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Detailed Solution

In NaCl, Cl^– ions are larger in size are present in close packing while Na⁺ ions are present in all the O.V.
No T.V present in CsCl.
In Zns; Zn⁺² ions are present in alternative T.V.
In Na₂O oxide ions have a cubic close packed arrangement and Na⁺ ions occupy all the T.V.

50% ‘Tetrahedral’ voids filled	ZnS
100% ‘octahedral’ voids	NaCl
100% ‘Tetrahedral’ voids filled	Na₂O
No ‘Tetrahedral’ voids present	CsCl

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