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X(g) → X^+(g) + e^–. What does this chemical reaction need to occur?

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X(g) → X^+(g) + e^–. What does this chemical reaction need to occur?

(a) Catalyst

(b) Electron affinity

(c) Electropositivity

(d) Ionization energy

I had been asked this question during an interview.

Asked question is from Periodic Trends in Properties of Elements in section Classification of Elements and Periodicity in Properties of Chemistry – Class 11

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Right choice is (d) Ionization energy

Easiest explanation: The minimum amount of energy that is required to remove an electron from an atom is called Ionization enthalpy. It is expressed in the units KJ/mol. Electron affinity is the change in the energy when we add an electron to a neutral atom. Electropositivity is a metallic characteristic. A catalyst speeds up the reaction.

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