Question

An ionic bond A+ B– is most likely to be formed when :

• A. The ionization energy of A is high and the electron affinity of B is low
• B. The ionization energy of A is low and the electron affinity of B is high
• C. The ionization energy of A and the electron affinity of B is high
• D. The ionization energy of A and the electron affinity of B is low

Answer 1

Answer: (B)

The ionization energy of A is low and the electron affinity of B is high

Answer 2

The conditions required for the formation of an ionic bond.

(i) Ionization enthalpy [M(g) $\rightarrow$ M+(g) + e–] of

electropositive element must be low.

(ii) Negative value of electron gain enthalpy [X (g) + e– $\rightarrow$

X–(g)] of electronegative element should be high.