Zone refining is a method to obtain

In electrolytic refining,the impure metal is used to make:

Mond's process is used for the purification of:

Boron and silicon of very high purity can be obtained through :

In the electrolytic refining of an impure metal,a rod of impure metal is used as the anode and a rod of pure metal is used as the cathode,and the aqueous solution of its salt is electrolyzed. Which of the following metals cannot be refined by this method?

The Van-Arkel process and Mond's process are used for the refining of which of the following metals,respectively?