Question

In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

• A. X2Y3
• B. X2Y
• C. X3Y4
• D. X4Y3

Answer 1

Answer: (D)

X4Y3

Answer 2

According to question : Number of Y atom in ccp unit cell

= 4

Number of X atom in ccp unit cell = 8 × $\frac{2}{3} = \frac{16}{13}$

Formula of compound = X16/3Y4 = X16 Y12 = X4 Y3