1.

The volume of atom present in a face-centred cubic unit cell of a metal (`r` is atomic radius ) isA. `(20)/(3) pir^(3)`B. `8pir^(3)`C. `4pir^(3)`D. `(16)/(3)pir^(3)`

Answer» Correct Answer - D
For fcc, `Z_(eff) = 4//"unit cell"`
Volume of atoms in the unit cell `= 4/3 pir^(3) xx Z_(eff)`
`= 4/3 pi r^(3) xx 4`
`= (16)/(3) pir^(3)`


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