| I. Mond's process for purification of nickel. |
| II. Removal of lead poisoning from the body. |
| III. Cyanide process for extraction of silver. |
| IV. Froth flotation process for separation of ZnS from galena ore by using depressant. |
A) I - \[\text{Ni(CO}{{\text{)}}_{\text{4}\,}}\] II - \[[\text{Pb}{{(EDTA]}^{2-}}\] III - \[{{\text{ }\!\![\!\!\text{ Ag(CN}{{\text{)}}_{\text{2}}}\text{ }\!\!]\!\!\text{ }}^{-}}\] IV - \[\text{ }\!\![\!\!\text{ Zn(CN}{{\text{)}}_{\text{2}}}\text{ }\!\!]\!\!\text{ }\]
B) I - \[\text{Ni(CO}{{\text{)}}_{\text{4}\,}}\] II - \[\text{ }\!\![\!\!\text{ Pb(EDTA}{{]}^{2-}}\] III - \[{{\text{ }\!\![\!\!\text{ Ag(CN}{{\text{)}}_{\text{2}}}\text{ }\!\!]\!\!\text{ }}^{-}}\] IV - \[{{\text{ }\!\![\!\!\text{ Zn(CN}{{\text{)}}_{\text{4}}}\text{ }\!\!]\!\!\text{ }}^{2-}}\]
C) I - \[\text{Ni(CO}{{\text{)}}_{\text{6}\,}}\] II - \[\text{ }\!\![\!\!\text{ Pb(EDTA}{{]}^{4-}}\] III - \[{{[\text{Ag(CN}{{\text{)}}_{\text{2}}}\text{ }\!\!]\!\!\text{ }}^{-}}\] IV - \[{{\text{ }\!\![\!\!\text{ Zn(CN}{{\text{)}}_{\text{6}}}\text{ }\!\!]\!\!\text{ }}^{4-}}\]
D) I - \[\text{Ni(CO}{{\text{)}}_{\text{4}}}\] II - \[\text{ }\!\![\!\!\text{ Pb(EDTA}{{]}^{2-}}\] III - \[{{\text{ }\!\![\!\!\text{ Ag(CN}{{\text{)}}_{\text{4}}}\text{ }\!\!]\!\!\text{ }}^{3-}}\] IV - \[{{\text{ }\!\![\!\!\text{ Zn(CN}{{\text{)}}_{\text{4}}}\text{ }\!\!]\!\!\text{ }}^{2-}}\]
Correct Answer: B
Solution :
[b] (I) Mond's process \[\underset{\operatorname{Im}\,\,pure\,}{\mathop{Ni+4CO}}\,\xrightarrow{50{}^\circ }\underset{\text{Volatile}\,\,\text{complex}}{\mathop{\left[ Ni{{(CO)}_{4}} \right]}}\,\xrightarrow{200{}^\circ C}\underset{\text{Pure}}{\mathop{Ni}}\,+4CO\uparrow \](II) Removal of lead poisoning \[P{{b}^{2}}+EDT{{A}^{4-}}\rightleftharpoons \left[ Pb(EDTA \right]{{)}^{2-}}\] (III) Cyanide process for extraction of silver \[2Ag+4NaCN+{{H}_{2}}O+\frac{1}{2}{{O}_{2}}\rightleftharpoons \] \[2Na\left[ Ag{{(CN)}_{2}} \right]+2NaOH\]
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