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Per NCERT §3.7.1(d), the ELECTRON GAIN ENTHALPY ΔₑgH represents enthalpy change for which reaction?
AX(g) + e⁻ → X⁻(g)
BX(s) → X(l)
C2 X(g) → X₂(g)
DX(g) → X⁺(g) + e⁻
Answer & Solution
Correct answer: A. X(g) + e⁻ → X⁻(g)
Per NCERT eqn 3.3, ΔₑgH for X(g) + e⁻ → X⁻(g). Negative when energy released, positive (endothermic) e.g. for noble gases.
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