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Question

Number of unit cells in 4g of X(atomic mass = 40 ). Which crystallises in bcc pattern is:

[$ N_A is Avogadro number]

A
0.1NA
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B
2×0.1NA
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C
0.1 ×NA2
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D
2×NA
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Solution

The correct option is D 0.1 ×NA2

Given that,

Atomic mass X=40

Now,

No of atoms unit cell for bcc z=2

No of atoms in 4g

=4g40g×NA

=0.1×NAatoms

Now, no of unit cells

=0.1×NA2unitcell

Hence, this required solution.


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