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Q.

The maximum covalency of aluminium is ‘6’ where as that of boron is ‘4’ because

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a

Aluminium is more electropositive than boron

b

‘Al’ is a metal where as boron is a non metal

c

‘Al’ can form a cation where as boron can not

d

‘Al’ contains vacant ‘d’ orbitals in its valence shell where as boron does not

answer is C.

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Detailed Solution

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The maximum covalency of aluminium is ‘6’ where as that of boron is ‘4’ because ‘Al’ contains vacant ‘d’ orbitals in its valence shell where as boron does not.

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