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Q.

The stable oxidation state of Thallium, a IIIA group element is

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a

+5

b

-3

c

+3

d

+1

answer is A.

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Detailed Solution

The outer electronic configuration of 'Tl' = 6s2 6p1

Due to Inert pair effect, only p-electrons involved in bonding

Therefore, The stable oxidation state of Thallium, a IIIA group element is +1.

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