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Boron does not form B3+ ions where as Al forms Al3+ ions. This is because

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By Expert Faculty of Sri Chaitanya
a
The size of B atom is larger than that of Al
b
The sum of IE1 + IE2 + IE3 of B is much higher than that of Al
c
The sum of IE1 + IE2 + IE3 of Al is much higher than that of B
d
Both 1 and 2

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detailed solution

Correct option is B

Due to its small size and high sum of first three ionisation energies B can't loose it's three valency electrons and can't form B+3 ion


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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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