1.

The Cr metal (atomic weight 52) crystallises BBC structure. The unit cell edge length is 2.88 Å. The density of Cr is 7.2 g ml^(-1). The number of atom is 52 g of Cr is

Answer»

`3 xx 10^(23)`
`12 xx 10^(23)`
`6 xx 10^(23)`
`9 xx 10^(23)`

Answer :C


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