NEET Chemistry The Solid State Questions Solved


A compound alloy of gold and copper crystallizes in a cube lattice in which the gold atoms occupy the lattice points at the corners of a cube and the copper atoms occupy the centres of each of the cube faces. The formula of this compound is-

(A) AuCu                                                   

(B) AuCu2

(C) AuCu3                                                 

(D) None of these 

(C). One-eight of each corner atom (Au) and one-half of each face-centred atom (Cu) are contained with in the unit cell of the compound.
Thus, the number of Au atoms per unit cell = 6×12=3.  The formula of the compound is AuCu3.

Difficulty Level:

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