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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
(IV) Cyanide process for extraction of silver
(V) Froth floatation process for separation of ZnS from galena ore by using depressant

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$(I) N i {(C O)}_{4} (I I) [A g {(C N)}_{2}]^{-} (I I I) {[P b (E D T A)]}^{2 -} {(I V) [A g {(C N)}_{2}]}^{-} (V) [Z n (C N)_{2}]$

$(I) N i {(C O)}_{4} (I I) [A g {(S_{2} O_{3})}_{2}]^{3 -} (I I I) {[P b (E D T A)]}^{2 -} (I V) [A g {(C N)}_{2}]^{-} (V) [Z n {(C N)}_{4}]^{2 -}$

$(I) N i {(C O)}_{6} (I I) [A g {(S_{2} O_{3})}_{2}]^{3 -} (I I I) {[P b (E D T A)]}^{4 -} (I V) [A g {(C N)}_{2}]^{-} (V) [P b {(C N)}_{6}]^{4 -}$

$(I) N i {(C O)}_{4} (I I) {[A g (S_{2} O_{3})]}^{-} (I I I) {[P b (E D T A)]}^{2 -} (I V) [A g {(C N)}_{4}]^{3 -} (V) [P b {(C N)}_{4}]^{2 -}$

answer is B.

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Detailed Solution

(I) Mond's Process:

$\underset{Impure}{Ni} + 4 CO ↑ \overset{50^{\circ} C}{\to} [\underset{Volatile complex}{Ni {(CO)}_{4}]} \overset{230 ° C}{\to} Ni + \underset{Pure}{4 CO ↑}$

(II) Removal of unreacted $AgBr$ from photographic plate:

$AgBr + 2 {Na}_{2} S_{2} O_{3} \to {Na}_{3} [Ag {(S_{2} O_{3})}_{2}] + NaBr$

(III) Removal of Lead poisoning

${Pb}^{2 +} + {EDTA}^{4 -} \to {[Pb (EDTA)]}^{2 -}$

(IV) Cyanide Process

${Ag}_{2} S + 4 NaCN + 2 O_{2} \to 2 Na [Ag {(CN)}_{2}] + 2 {Na}_{2} {SO}_{4}$

(V) Separation of $ZnS$ from $PbS$

$ZnS + {CN}^{-} \to [Zn {(CN)}_{4}]^{2 -}$

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