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Question: Ionisation enthalpy ![](https://cdn.pureessence.tech/canvas_127.png?top_left_x=0&top_left_y=1347&wid...

Ionisation enthalpy for the elements of group 13 follows the order.

A

B > Al > Ga > In > Tl

B

B< Al < Ga < In < Tl

C

B<Al> Ga < In >Tl

D

B > Al < Ga > In < Tl

Answer

B > Al < Ga > In < Tl

Explanation

Solution

: 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.