The metal purified by Mond process is $X$. The number of unpaired electrons in $X$ is

Which of the following methods is useful for producing semiconductor grade metals of high purity?

Which of the following is not associated with water molecules ?

$$ \text { Match the following } $$

$$ \begin{array}{llll} \hline & \text { List-I (Process) } & & \text { List-II (Metal) } \\ \hline \text { (A) } & \text { Hall-Heroult process } & \text { (I) } & \mathrm{Ti} \\ \hline \text { (B) } & \text { Mond process } & \text { (II) } & \mathrm{In} \\ \hline \text { (C) } & \text { van-Arkel process } & \text { (III) } & \mathrm{Al} \\ \hline \text { (D) } & \text { Zone refining process } & \text { (IV) } & \mathrm{Ni} \\ \hline \end{array} $$

The correct answer is