In which of the following structures coordination number for cations and
anions in the packed structure will be same?
(i) Cl- ion form fcc lattice and Na+ ions occupy all octahedral voids of the unit cell.
(ii) Ca2+ ions form fcc lattice and F - ions occupy all the eight tetrahedral voids of the unit cell.
(iii) O2- ions form fcc lattice and Na+ ions occupy all the eight tetrahedral voids of the unit cell.
(iv) S2- ions form fcc lattice and Zn2+ ions go into alternate tetrahedral voids of the unit cell.
NCERT Class XII
Chemistry - Exemplar Problems
Chapter 1. Solid State
Answers
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15
(iii)is the answer(nt 100 % sure)
Answered by
2
Answer:
A and D
Explanation:
The ratio of coordination number of Na
+
and Cl
−
in NaCl is 1:1 i.e. same coordination no. for both Na
+
and Cl
−
.
The ratio of coordination number of Ca
+2
and F
−
in CaF
2
is 2:1 i.e. different coordination no. for Ca
+2
and F
−
.
The ratio of coordination number of Na
+
and O
−2
in Na
2
O is 1:2 i.e. different coordination no. for Na
+
and O
−2
.
The ratio of coordination number of Zn
+2
and S
−2
in ZnS is 1:1 i.e. same coordination no. for both Zn
+2
and S
−2
.
Hence, Options "A" & "D" are correct answers.
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