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

In a hypothetical solid , C atoms are found to form cubical close - pa

1.	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
Answer» Solution :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.