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

Options

A. `{:(I,II,III),(Ni(CO)_(4),[Ag(CN)_(2)]^(-),[Pb(EDTA)]^(2-)):}`
B. `{:(I,II,III),(Ni(CO)_(4),[Ag(S_(2)O_(3))_(2)]^(3-),[Pb(EDTA)]^(2-)):}`
C. `{:(I,II,III),(Ni(CO)_(6),Ag(S_(2)O_(3))_(2)]^(3-),([Pb(EDTA)]^(4-)):}`
D. `{:(I,II,III),(Ni(CO)_(6),[Ag(S_(2)O_(3))]^(-),[Pb(EDTA)]^(2-)):}`

Answer

B

Explanation

(I) Mond.s process for purification of Ni-`[Ni(CO)_(4)]`
(II) Removal of unreacted AgBr from photographic plate-`[Ag(S_(2)O_(3))_(2)]^(3-)`
(III) Removal of lead poisoning from body-`[Pb(EDTA)]^(2-)`.