VITEEE 2015 Paper

In the unit cell number of Cu atoms (fcc/ccp)
= 8 ×

1

6

+ 6 ×

1

2

= 4
As Ag atoms occupying edge centred = 12 ×

1

4

= 3
and Au atoms are presents at the body centred = 1
∴ formula, Cu4Ag3Au