Complexes formed in the following methods are :
(1) Mond’s process for purification of nickel
(2) Removal of lead poisoning from the body
(3) Cyanide process for extraction of silver
(4) Froth floatation process for separation of ZnS from galena ore by using depressant

Options

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

Answer

B

Explanation

(I) Mond's process
`underset("Impure") (Ni) +4CO overset(50^@C)rarr underset(underset("complex")("Volatile"))([Ni(CO)_(4)]) overset(200^@C)rarr underset("Pure") (Ni)+ 4CO uarr`
(II) Removal of lead poisoning
`Pb^(2+) + EDTA^(4-) hArr[Pb(EDTA)]^(2-)`
(III) Cyanide process for extraction of silver
`4Ag+4NaCN+H_(2)O+(1)/(2)O_(2)hArr 2Na[Ag(CN)_(2)]+2NaOH`
(IV) Separation of `ZnS` from galena by using depressant in froth floatation process
`ZnS + CN^(Ө) hArr [Zn(CN)_(4)]^(2-)`.