‘Lapis-Lazuli’ is a blue coloured precious stone. It is mineral of the class
Sodium alumino silicate
Lapis lazuli is the sodium alumino silicate present in earth rocks as blue stone.
Which statement is correct?
Flux is used to remove
The final step for the extraction of copper from copper pyrite in Bessemer converter involves the reaction.
Auto-reduction process is used in the extraction of
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
Gallium arsenide is purified by