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Q.

Aluminium metal has a density of 2.72 g/cm3 and crystallizes in a lattice with an edge length of 404 pm. Which of the following alternatives are correct?

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a

Its coordination number is 8

b

It forms a face centred cubic unit cell

c

It forms a body centred cubic unit cell

d

Its coordination number is 6

answer is B.

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Detailed Solution

2.72=Z×27404×10−103×NA

⇒Z=4

if the value of z = 4. It forms a face centred cubic unit cell.

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