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Q.

The coordination numbers of cation and anion in NaCl crystal are respectively

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a

8,8

b

6,6

c

8,6

d

6,8

answer is C.

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Detailed Solution

Sodium chloride, NaCl has face centered cube (FCC) lattice and each anion and cation in NaCl is surrounded by 6 opposite ions.  Hence, the Co-ordination number of Na+  or Cl− is 6.

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