STANDARD Chemistry Ionisation Enthalpy MCQ Question
Ionisation enthalpy (ΔᵢH₁ kJ mol⁻¹) for the elements of Group 13 follows the order
B > Al > Ga > In > Tl
B < Al < Ga < In < Tl
B < Al > Ga < In > Tl
B > Al < Ga > In < Tl
Correct Answer
Detailed Explanation
The ionisation enthalpy generally decreases down the group due to the increase in atomic size and shielding effect, but irregularities occur due to d and f block contraction.
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