Match List I with List II

Choose the correct answer from the options given below:

A-IV, B-I, C-III, D-II

The correct answer is 4. A-IV, B-I, C-III, D-II.

A. Hall Heroult Process

The Hall-Héroult process is the most widely used method for the production of aluminum. It involves the electrolysis of molten alumina \((Al_2O_3)\) in a cryolite \((Na_3AlF_6)\) bath. The reaction is:

\(2Al_2O_3 + 3C \longrightarrow 4Al + 3CO_2\)

B. Mond Process

The Mond process is a process for the purification of nickel. It involves the reaction of nickel with carbon monoxide \((CO)\) to form nickel carbonyl \((Ni(CO)4)\). The nickel carbonyl is then decomposed to yield pure nickel. The reaction is:

\(Ni + 4CO\overset{350K}{\longrightarrow} Ni(CO)_4\underset{450K}{\overset{\Delta }{\longrightarrow}} Ni + 4CO\)

C. Leaching

Leaching is a process used to extract a substance from a mixture by dissolving it in a solvent. In the extraction of gold from ore, leaching is used to dissolve gold cyanide \(([Au(CN)_2]^-)\) from the ore using a solution of sodium cyanide \((NaCN)\). The reaction is:

\(4Au + 8CN^- + 2H_2O + O_2 \longrightarrow 4[Au(CN)_2]^- + 4OH^-\)

D. Van Arkel Method

The Van Arkel method is a process for the purification of metals. It involves the sublimation of a metal halide and its subsequent decomposition to yield pure metal. In the purification of zirconium, zirconium iodide (ZrI4) is sublimed and then decomposed to yield zirconium. The reaction is:

\(Zr + 2I_2 \longrightarrow ZrI_4\)

The correct match is: 3. A-IV, B-I, C-III, D-II