An alloy of copper, silver and gold is found to have a copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body centre, the alloy has a formula: (a) CuAgAu (b) Cu4Ag2Au (c) Cu4Ag3Au (d) Cu4Ag4Au

Effective number of Cu atoms in a unit cell = 8 x (1/8) + 6 x (1/2)

Effective number of Cu atoms in a unit cell = 1 + 3 = 4

Effective number of Ag atoms in a unit cell = 12 x (1/4)

Effective number of Ag atoms in a unit cell = 3 x 1 = 3

Effective number of Au atoms in a unit cell = 1

Hence,

The general formula of compound is Cu4Ag3Au

So, the correct option is (c) 

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