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Ionization enthalpy of elements of 13th group

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By Expert Faculty of Sri Chaitanya
a
decreases from B to Al
b
very close for Al and Ga
c
slightly increases from In to Tl
d
all of these

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detailed solution

Correct option is D

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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The bond dissociation energy of BF bond in BF3 is 646 kJ mol–1 whereas that of CF in CF4 is 315 kJ mol–1. The correct reason for higher B-F bond dissociation energy as compared to that of C-F bond is :

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