1.

Ionisation enthalpy (Delta_(i) H_1 kj "mol"^(-1)) for the elements of Group 13 follows the order.

Answer»

`B gt AL gt Ga gt In gt TL`
`B LT Al lt Ga lt In lt Tl`
`B lt Al gt Ga lt In gt Tl`
`B gt Al lt Ga gt In lt Tl`

Answer :D


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