# 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) $AuC{u}_{2}$

(C) $AuC{u}_{3}$

(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 = $6×\frac{1}{2}=3$.  The formula of the compound is $AuC{u}_{3}$.

Difficulty Level:

• 18%
• 16%
• 67%
• 2%
Crack NEET with Online Course - Free Trial (Offer Valid Till August 25, 2019)