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Question

How many unit cells are present in 39 gm of potassium that crystallises in body-centred cubic structure?

A
NA
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B
NA4
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C
0.5NA
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D
0.75NA
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Solution

The correct option is C 0.5NA

No. of atoms =3939×NA=NA
In bcc unit cell = Z = 2
No. of unit cell =NA2=0.5NA

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