Question

A solid is made of two elements X and Z. The atoms Z are in ccp arrangement while the atoms X occupy all the tetrahedral sites. What is the formula of the compound?
(a) XZ
(b) XZ₂
(c) X₂Z
(d) X₂Z₃

Answer 1

Xz i think its rgt i hope so its rgt

Answer 2

Answer: (C) X2Z is the correct answer.

Explanation:

A solid is made of two elements X and Z.

The atoms Z : ccp arrangement

The atoms X : all the tetrahedral sites.

To find:

The formula of the compound:

In the CCP arrangement no.of formula units per unit cell =4 (1+3)

Since there are eight spheres at eight corners. And one sphere is at the centre of each face.

Z=4

X will occupy the tetrahedral sites

Tetrahedral sites are twice the number of octahedral sites , hence

X = 8

The simple whole number ratio between them gives

Z:X = 4:8 =1:2

Thus the formula of the compound is ZX2

Ans C) X2Z