Dihydrogen of high purity (> 99.95%) is obtained through :

Boron of highest purity (~99.9%) is obtained by

Boron of highest purity (~99.9%) is obtained by

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

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

Assertion : Hydrogen cannot be prepared in laboratory. Reason : Hydrogen of high purity is obtained by electrolysing warm aqueous barium hydroxide between Nickel electrods.

High purity copper is obtained by