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CGP EDU Academic Team
Published on: August 11, 2026
Ionisation enthalpy 
for the elements of group 13 follows the order.
Text Solution
Verified by ExpertsThe correct answer is:
D
The decrease in ionisation enthalpy from B to Al is associated with increase in size. The observed discontinuity in the ionisation enthalpy values between Al and Ga, and between In and Tl are due to inability of d – and f – electrons, which have low screening effect, to compensate theincrease in nucler charge.
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