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Anamolous Behaviour of Boron

Question

Which of the following exhibit covalency only upto 4?
Boron
Aluminium
Thallium
Indium

A

Aluminium

B

Thallium

C

Boron

D

Indium

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Solution

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Boron exhibit maximum covalency of four e.g., ${B H_{4}}^{-}$ ion while other members exhibit a maximum covalency of six e.g., $[A l {(O H)}_{6}]^{3 -}$ .

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