How many effective $N a^{+} a n d C l^{-}$ ions are present respectively in a unit cell of NaCl solid (Rock salt structure) if all ions along line connecting opposite face centres are absent?

3, 3

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\frac{7}{4}, 4

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\frac{7}{2}, \frac{7}{2}

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4, \frac{7}{2}

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Solution

The correct option is A $3, 3$
No. of $N a^{+} = 4 - 1 = 3$
No. of $C l^{-} = 4 - (2 \times \frac{1}{2}) = 3$

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