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Which one of the following elements does...

Which one of the following elements does not form triiodide on reating with iodine?

A

B

B

TI

C

AI

D

Ga

Text Solution

Verified by Experts

Borom show consistently + 3 oxidation state in its compounds while rest of the elements show + 1 as well as + 3 oxidation states. The + 1 oxidation state becomes more and more stable as we move down the group, i.e.
`Al lt Ga lt In lt Tl`
This is due to the presence of intervening d- and f - orbitals which do not shield the nucleus effectively. Consequently effective nuclear charge
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