In the extraction of aluminium metal, one of the process is summarised as follows: array…

In the extraction of aluminium metal, one of the process is summarised as follows:
\[\begin{array}{l} \underset{\left(\begin{array}{l} \text { Impure bauxite }) \\ \mathrm{Al}_{2} \mathrm{O}_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O} \end{array}\right.}{\text { hot conc. }} \underset{\text { (aqueous soln.) }}{\text { Product (II) }} \xrightarrow[\text { to change pH }]{\text { bubble gas (III) }} \\ \underset{\text { mixed with(IV) }}{\mathrm{Al}_{2} \mathrm{O}_{3} \cdot 2 \mathrm{H}_{2} \mathrm{O}} \xrightarrow[\text { electrolysed with carbon electrodes }]{\text { (Pure) }} \mathrm{Al} \text { at (V) } \end{array}\]
Which of the following entries correctly summarises reagents, electrodes & products of the process?
\[\begin{array}{cccccc} & \text { I } & \text { II } & \text { III } & \text { IV } & \text { V } \\ \text { (a) } & \mathrm{NaOH} & \mathrm{Al}^{3+} & \mathrm{HF} & \mathrm{Na}_{3} \mathrm{AlF}_{6} & \text { Cathode } \\ \text { (b) } & \mathrm{NaOH} & \mathrm{NaAlO}_{2} & \mathrm{CO}_{2} & \mathrm{NaF}_{1} & \text { Anode } \\ \text { (c) } & \mathrm{H}_{2} \mathrm{SO}_{4} & \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3} & \mathrm{NH}_{3} & \mathrm{Na}_{3} \mathrm{AlF}_{6} & \text { Cathode } \\ \text { (d) } & \mathrm{NaOH} & \mathrm{NaAlO}_{2} & \mathrm{CO}_{2} & \mathrm{Na}_{3} \mathrm{AlF}_{6} & \text { Cathode } \end{array}\]