Home › NEET UG › chemistry › c11ie_egh_en_periodic › Per NCERT §3.7.1(c), the FIRST IONISATION ENTHAL…
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.
Related questions
The most electronegative element on the periodic table is:Among Li, Na, K, Cs, the element with the highest first ionisation enthalpy is:Across a period from left to right, atomic radius generally:The modern periodic law arranges elements in order of:Per NCERT §3.7.3, oxides of elements show what acid–base trend across a period?Per NCERT §3.7.2(b) (anomalous), the DIAGONAL RELATIONSHIP refers to similarity between whPer NCERT Problem 3.8, predicting the formula formed by SILICON (Group 14) and BROMINE (GrPer NCERT §3.7.2(a) (valence), the VALENCE of representative (s + p block) elements equals