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 a bonded 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

The correct option is A An element which has high electronegativity always has high electron gain enthalpy

Elements with high electronegativity usually but not always have high electron gain enthalpies.

For example, both N and Cl have an electronegativity of 3.0 but the electron gain enthalpy of N is +ve while that of chlorine is the highest with negative sign in the periodic table.