Question

In a solid having rock salt structure, if all the atoms touching one body diagonal plane are removed

(except at body centre), then the formula of the left unit cell is :

• A. $A_{3.5}{B}_{2.5}$
• B. $A_7{B}_3$
• C. $A_5{B}_3$
• D. $A_3{B}_5$

Answer 1

The correct option is A $A_{3.5}{B}_{2.5}$

$A_{4-2\times \frac{1}{4}}=A_{3.5}$

$B_{4-2\times \frac{1}{2}-4\times \frac{1}{8}}=B_{2.5}$

$A_{3.5}{B}_{2.5}$

Hence the correct option is A.