Q.

In NaCI lattice, the coordination number of Cl- ion is

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a

2

b

6

c

4

d

8

answer is B.

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Detailed Solution

Each Na+ is surrounded by six Cl- ions in NaCl crystal lattice and each Cl-  is surrounded by 6 Na+ ions. Co-ordination number is 6 : 6. Radius ratio of NaCl is 0.54.
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