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Per NCERT §3.7.1(c), the FIRST IONISATION ENTHALPY of an element X represents which process?
AEnergy of X(g) + X(g) → X₂(g)
BEnergy required for X(g) → X⁺(g) + e⁻
CEnergy released when X(g) + e⁻ → X⁻(g)
DEnergy of X(s) → X(g)
Answer & Solution
Correct answer: B. Energy required for X(g) → X⁺(g) + e⁻
Per NCERT eqn 3.1, ΔᵢH₁: X(g) → X⁺(g) + e⁻. Always positive.
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