MEDIUMMCQ SINGLENEET ChemistryInorganic Chemistryp-Block (group 13 and 14)Introduction to p-block Elements

Ionisation enthalpy i ( H kJ mol ) - D 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✓ Correct

Explanation

I.E. trend is group-13 B >Al >Ga >In >Tl expected EXERCISE - 1 : Basic Objective Questions p-BLOCK (GROUP 13 AND 14) 2 But B > Al < Ga > In < Tl actual Due to poor shielding of d-orbital in Ga and poor shielding of f-orbital in Tl, underwent more effective nuclear charge.

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