Question

Which one of the following is incorrect?

(a) An element which has high electronegativity always has high electron gain enthalpy.

(b) Electron gain enthalpy is the property of an isolated atom.

(c) Electronegativity is the property of a bonded atom.

(d) Both electronegativity and electron gain enthalpy are usually directly related to nuclear charge and inversely related to atomic size.

Answer 1

Correct option : (a)

Explanation —

Elements with high electronegativity usually but not always have high negative electron gain enthalpies. e.g., both $\mathrm{N}$ and $\mathrm{Cl}$ have an electronegativity of $3.0$ but the electron gain enthalpy of $\mathrm{N}$ is positive while that of chlorine is the highest with negative sign in the periodic table.