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The cubic unit cell of aluminium (molar ...

The cubic unit cell of aluminium (molar mass `27.0 g//"mol"` ) has an edge length of 405 pm. Its density is `2.70 g//c c`. The type of unit cell is :

A

face centred

B

body centred

C

primitive

D

edge centred

Text Solution

Verified by Experts

The correct Answer is:
C
`d=(ZtimesM)/(a^(2)timesN_(0)times10^(-30))`
`"or "Z=(d timesa^(3)timesN_(0)times10^(-30))/M`
=`(2.7times(405)^(3)times(6.02times10^(23))10^(-30))/27=4`
Hence it is face centred cubic unit cell.
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