MCQ
The correct code for stability of oxidation states for given cations is

$(i)$ $P{b^{2 + }} > P{b^{4 + }},T{l^ + } < T{l^{3 + }}$         $(ii)$ $Bi^{3+} < Sb^{3+} , Sn^{2+} < sn^{4+}$

$(iii)$ $P{b^{2 + }} > P{b^{4 + }},B{i^{3 + }} > B{i^{5 + }}$     $(iv)$ $T{l^{3 + }} < I{n^{3 + }},S{n^{2 + }} > S{n^{4 + }}$

$(v)$ $S{n^{2 + }} < P{b^{2 + }},S{n^{4 + }} > P{b^{4 + }}$     $(vi)$ $S{n^{2 + }} < P{b^{2 + }},S{n^{4 + }} < P{b^{4 + }}$

  • A
    $(v)$ and $(vi)$
  • B
    $(i) , (iii)$ and $(vi)$
  • $(iii)$ and $(v)$
  • D
    $(ii)$ and $(iv)$

Answer

Correct option: C.
$(iii)$ and $(v)$
c
Due to inen effect the stability of lower oxidation state gradually increases while stability Of higher oxidation state gradually decreases down the group in elements of group $13^{th}$ to $15^{th}$. So correct orders are :

$(iii)$ $Pb^{2+} \,> \,Pb^{4+} , Bi^{3+} \,>\, Bi^{s+}$

$(iv)$ $Sn^{2+}\, < \,Pb^{2+} , Sn^{4+} \,>\, Pb^{4+}$

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