Question

In a CCP lattice of X and Y, X atoms are present at the corners while Y atoms are at face centers.Then the formula of the compound would be if one of the X atoms from a corner is replaced by Z atoms (also monovalent)?

(A) X7Y24Z2

(B) X7Y24Z

(C) X24Y7Z

(D) XY24Z

Answer 1

Correct Answer is: (B) X7Y24Z

X = 7x 1/2 = 7/8;

Y = 1/2 x 6 = 3.;

Z = 1/8 .

⇒ X7/8 Y3 Z1/8 = X7Y24Z