Questions
The electropositive character increases from B to Al and then decreases from Al to Tl because of
detailed solution
Correct option is C
Electronegativity order : B > Tl > In > Ga > AlElectropositivity order: B < Tl < In < Ga < AlElectronegativity of 13th group elements decreases from B to Al, due to increase in atomic radii ,thereafter increases up to thallium.From Al to Ga Electronegativity is increased due to poor shielding effect by completely filled inner shell 3d10 electronic configuration of "Ga".From In to Tl the increase in electronegativity is due to effect from lanthanoid contraction .Since the electronegativity of Al is least in this group ,hence it is most electro positive element in Boron family.Similar Questions
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 BF bond dissociation energy as compared to that of CF bond is :
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