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Which equation represents the first electron affinity of chlorine?
a. cl(g) + e- → cl - (g)
b. 1 2 cl2 (g) + e- → cl - (g)
c. cl + (g) + e- → cl(g)
d. cl(g) → cl + (g) + e-?

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transitionstate
Answer:
            Option-A [Cl (g) + e⁻  →  Cl⁻ (g)] is the correct answer.

Explanation:
                   First electron affinity is the amount of heat evolved when an electron is added to a neutral atom.
                   Such problems often come in questions related to Born-Haber Cycle topic. Let suppose Mg and Cl₂ is reacted to form MgCl₂ crystal.

Then the Cl₂ gas is first atomized as follow,

                                        Cl₂     →     2 Cl

After atomization an electron is added to neutral chlorine atoms, as,

                                      Cl  +  e⁻    →     Cl⁻

So, option A is correct choice.
dsdrajlin

The first electron affinity of chlorine is represented by the following equation:

a. Cl(g) + e⁻ → Cl⁻(g)

What is the electron affinity?

The electron affinity of an atom is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form an anion.

Which equation represents the first electron affinity of chlorine?

  • a. Cl(g) + e⁻ → Cl⁻(g)

Yes, since it follows the definition of electron affinity.

  • b. 1/2 Cl₂(g) + e⁻ → Cl⁻ (g)

No, since the reactant is not the atom of chlorine.

  • c. Cl⁺(g) + e⁻ → Cl(g)

No, since the reactant is not neutral.

  • d. Cl(g) → Cl⁺(g) + e⁻

No, since an electron is lost.

The first electron affinity of chlorine is represented by the following equation:

a. Cl(g) + e⁻ → Cl⁻(g)

Learn more about electron affinity here: https://brainly.com/question/1287606