statement(I): Bi⁺⁵ salts are very good oxidising agents

statement(II): Bismuth is more stable in +3 state than in +5 state

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Both (I) & (II) are true

Both (I) & (II) are false

(I) is false & (II) is true

(I) is true & (II) is false

answer is A.

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Detailed Solution

Due to Lanthanoid contraction , size increases from Sb to Bi is small

In 'Bi' nuclear attraction over outermost electrons is more. Thus the paired 'ns' electrons are reluctant

to uncouple and participate in bonding . Due to this reason 'Bi' shows an ox. state '+3' (corresponding to ground state)

And it is unstable in higher ox. state(+5)

Compounds of 'Bi' in '+5' state (except BiF₅) are unstable and undergo reduction to form stable compounds with '+3' state

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