Which of the following represents electron affinity?

University of Ilorin CHM101 2023 past question

1. Cl(g) + e⁻ → Cl⁻(g)
2. Ca²⁺ + 2e⁻ → Ca(g)
3. CO²⁺ → CO³⁺ + e⁻
4. Cl⁺ + energy → Cl(g)

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