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