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A metal crystallises into two cubic phas...

A metal crystallises into two cubic phases , face centred cubic (fcc) and body centred cubic (bcc) , whose unit cell lengths are 3.5 Å and 3.0 Å , respectively. The ratio of densities of fcc and bcc is

A

`3.12`

B

`2.04`

C

`1.26`

D

`0.72`

Text Solution

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The correct Answer is:
3
`d=(ZM)/(a^(3)N_(A))" "(d_(1))/(d_(2))=(4)/((3.5)^(3))xx((3)^(3))/(2)=1.26`
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