Question

Complexes formed in the following methods are:
(I) Mond's process for purification of nickel
(II) Removal of unreacted $AgBr$ from photographic plate
(III) Removal of lead poisoning from the body

• A. I. $Ni(CO{)}_4$, II. $\left[Ag\right(CN{)}_2{]}^{-}$, III. $\left[Pb\right(EDTA){]}^{2-}$
• B. I. $Ni(CO{)}_4$, II. $\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$, III. $\left[Pb\right(EDTA){]}^{2-}$
• C. I. $Ni(CO{)}_6$, II. $\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$, III. $\left[Pb\right(EDTA){]}^{4-}$
• D. I. $Ni(CO{)}_6$, II. $\left[Ag\right(S_2{O}_3){]}^{-}$, III. $\left[Pb\right(EDTA){]}^{2-}$

Answer 1

The correct option is B I. $Ni(CO{)}_4$, II. $\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$, III. $\left[Pb\right(EDTA){]}^{2-}$

(I) Mond's process for purification of nickel is based on the formation and decomposition of the complex,$\left[Ni\right(CO{)}_4]$

$Ni+4CO⟶\left[Ni\right(CO{)}_4]$

(II) Removal of unreacted AgBr from photographic plate -$\left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$

$A{g}^{+}+2S_2{O}_3^{2-}\rightleftharpoons \left[Ag\right(S_2{O}_3{)}_2{]}^{3-}$

(III) Removal of lead poisoning from the body -$\left[Pb\right(EDTA){]}^{2-}$

Hence, the correct option is $\text{B}$