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a
Its size is smaller than that of Al
b
Its ionization enthalpy is very close to that of Al
c
Its m.p. is lowest in the family (only30o C)
d
All of the above
answer is D.
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Detailed Solution
Size of Al is =143 pm ; Ga =135 pmIonisation enthalpy of Al =577 KJ/mol and Ga =579 KJ/molMelting point order B >Al >Tl >In >GaGallium exist as liquid state during summer