Q. Consider the Born-Haber cycle for the formation of an ionic compound given below and identify the compound (Z) formed. $\begin{bmatrix} M(s){\overset{\mathrm{\Delta}H_{1}}{\rightarrow}M(g){\overset{\mathrm{\Delta}H_{2}}{\rightarrow}M^{+}(g)}} \\ \frac{1}{2}X_{2}(g){\overset{\mathrm{\Delta}H_{3}}{\rightarrow}X(g)\overset{\mathrm{\Delta}H_{4}}{\rightarrow}}X^{-}(g) \end{bmatrix}\overset{\mathrm{\Delta}H_{5}}{\rightarrow}Z$
A) $M^{+}X^{-}$
B) $M^{+}X^{-}(s)$
C) $MX$
D) $M^{+}X^{-}(g)$
Explanation
(b)
The Born-Haber cycle takes place as follows
[image:4_image94.emf]
Hence, $Z\$is$\ M^{+}\ X^{-}\ (s)$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.