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Q.

Possible oxidation states of boron family is

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a

+2, +4

b

+1, +3

c

only +1

d

only +2

answer is A.

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Detailed Solution

As $n s^{2} n p^{1}$ the electronic configuration and oxidation states of the boron family is +3 . But due to the inert pair effect, higher elements show +1 oxidation state.

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Possible oxidation states of boron family is