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Statement-I : Coordination number of metallic solid having cubic closed packing is twelve.
Statement-II : Effective number of atoms per unit cell in cubic closed packing arrangement is four.

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Both I and II are false

Both I and II are true

I is false, II is true

I is true, II is false

answer is B.

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Detailed Solution

I) Each sphere is surrounded by six spheres in the same layer and three from layer
above and three from layer below

II) $Z = 8 \times \frac{1}{8} + 6 \times \frac{1}{2} = 4$

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