Question

In a hypothetical solid , C atoms are found to form cubical close - packed lattice . A atoms occupy all tetrahedral voids and B atoms occupy all octahedral voids .

A and B atoms are of appropriate size , so that there is no distortion in the ccp lattice of C atoms . Now if a plane as shown in the above figure is cut , then the cross section of this plane will look like
A.
B.
C.
D.

Answer 1

Correct Answer - C
From figure, it is clear 4 corners and 2 face centers lie on the shaded plane. Therefore, there will be six C atoms, and atoms (marked A) in TVs do not touch other.
Fig. (a) is not possible, four atom marked C.
Fig (b) isnot possible , atoms A in TVs are not shown in figure.
Fig (c) is possible , since atoms A in TVs are not touching each other.
Fig (d) is not possible , since atoms A in TVs are touching each other.