An alloy of copper, silver and gold is found to have copper constituting the ccp lattice. If silver atoms occupy the edge centres and gold is present at body centre, the alloy will have the formula

Options

A. `Cu_(4)Ag_(2)Au`
B. `Cu_(4)Ag_(4)Au`
C. `Cu_(4)Ag_(3)Au`
D. `CuAgAu`

Answer

C

Explanation

Effective no. of Cu in a unit cell`=8xx(1)/(8)+6xx(1)/(2)=4`
Effective no. of Ag in a unit cell`=12xx(1)/(4)=3`
Effective no. of Au in a unit cell=1
So, general formula of compound is `Cu_(4)Ag_(3)Au`.