Ionization enthalpy of elements of 13th group

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decreases from B to Al

very close for Al and Ga

slightly increases from In to Tl

all of these

answer is D.

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Detailed Solution

Ionisation energies order B > Tl >Ga >Al >InGa IE =579KJ/mol and Al IE =577KJ/mol almost sameHigh IE for Tl is due to inert pair effect

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