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Ionisation enthalpy (Delta(t)H(l) "in" k...

Ionisation enthalpy `(Delta_(t)H_(l) "in" kJ mol^(-1))` for the elements of group-13 follows the order

A

`B gt AI gt Ga gt In gt TI`

B

`B lt AI lt Ga lt In lt TI`

C

`B lt AI gt Ga lt In gt TI`

D

`B gt AI lt Ga gt In lt TI`

Text Solution

Verified by Experts

The correct Answer is:
D
The decrease in ionisation enthalpy from B to AI is associated with increases in size. The observed discontinuity in the ionisation enthlapy values between AI and Ga and between In and TI are due to inability of d-and f-electronns which in nuclear change.
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