By Which Of The Following Processes, The Ore Is Made Porous?

Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metal is

van-Arkel method of purification of metals involves converting the metal to a

A metal which is refined by poling is

Wolframite ore is separate from tin stone ore by the process of

Pb and Sn are extracted from their chief ore by

‘Lapis-Lazuli’ is a blue coloured precious stone. It is mineral of the class

Gallium arsenide is purified by

Which of the following is correct?

Metals found in free as well as combined states are

Stainless steel has iron and