Match the following
\(\begin{array}{ll}
\text{List - I} & \text{List - II} \\
\text{A) } \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{NaOH}+3 \mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{Na}\left[\mathrm{Al}(\mathrm{OH})_4\right] & \text{I) Roasting} \\
\text{B) } \mathrm{Ni}(\mathrm{CO})_4 \xrightarrow{230^{\circ} \mathrm{C}} \mathrm{Ni}+4 \mathrm{CO} & \text{II) Calcination} \\
\text{C) } \mathrm{Fe}_2 \mathrm{O}_3 \cdot 3 \mathrm{H}_2 \mathrm{O} \xrightarrow{\Delta} \mathrm{Fe}_2 \mathrm{O}_3+3 \mathrm{H}_2 \mathrm{O} & \text{II) Vapour phase refining} \\
\text{D) } 2 \mathrm{PbS}+3 \mathrm{O}_2 \rightarrow 2 \mathrm{PbO}+2 \mathrm{SO}_2 & \text{IV) Electrolysis} \\
& \text{V) Leaching}
\end{array}\)
The correct answer is

1. A \(\begin{array}{llll}
   \underline{\mathrm{A}} & \underline{\mathrm{B}} & \underline{\mathrm{C}} & \underline{\mathrm{D}} \\
   \mathrm{V} & \text {II } & \text {II } & \text {I }
   \end{array}\)
2. B \(\begin{array}{llll}
   \underline{\mathrm{A}} & \underline{\mathrm{B}} & \underline{\mathrm{C}} & \underline{\mathrm{D}} \\
   \text {II } & \text {II } & \text {IV } & \text {V } \\
   \end{array}\)
3. C \(\begin{array}{llll}
   \underline{\mathrm{A}} & \underline{\mathrm{B}} & \underline{\mathrm{C}} & \underline{\mathrm{D}} \\
   \text {IV } & \text {II } & \text {II } & \text {I }
   \end{array}\)
4. D \(\begin{array}{llll}
   \underline{\mathrm{A}} & \underline{\mathrm{B}} & \underline{\mathrm{C}} & \underline{\mathrm{D}} \\
   \text {I } & \text {II } & \text {IV } & \text {II }
   \end{array}\)