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Q.

Ionisation enthalpy $(ΔHKJ {mole}^{- 1})$ for the elements of group 13 follows the order

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a

B > Al > Ga > In > Tl

b

B < Al > Ga < In > Tl

c

B < Al < Ga < In < Tl

d

B > Tl > Ga > Al > In

answer is D.

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Detailed Solution

On moving down the group from B to Tl, a regular decreasing trend in the I.E. is not observed.
In Ga, there are ten d-electrons in the penultimate shell which screen the nuclear charge less effectively and thus, outer electron is held firmly. As a result, the ionization potential of both Al and Ga is nearly the same.
The increase in ionization potential from In to Tl is due to poor shielding effect of 14f electrons present in the inner shell.
Thus, the correct order is, B>Al<Ga>In<Tl

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Ionisation enthalpy ΔHKJmole−1 for the elements of group 13 follows the order