Azurite is a basic carbonate ore of copper.2CuCO3. Cu(OH)2
Solution
Which one of the following does not occur as sulphide ore?
Solution
Except chromium all the given metals exists as their sulphides.Zn exists as zinc blende ZnS.Silver exists as silver glance Ag2S.Iron exists as iron pyrites FeS2
Carborundum - SiC
Epsomite or Epsom salt - MgSO4.7H2O
Cassiterite - SnO2
Spodumene - Ore of lithium
The most abundant metal on the surface of the earth is
Solution
Al is most abundant metal on the surface of the earth.
Autoreduction is employed in the metallurgy is
Solution
Autoreduction or self reduction is mainly used for sulphide ores of less electropositive metals like Hg, Pb, Cu, etc.
2PbS + 3O2 ⟶ 2PbO + 2SO2
2PbO + PbS ⟶ 3Pb + 2SO2
Copper can be extracted from
Solution
Malachite is CuCO3. Cu(OH)2 it is ore of copper.
Leaching is a process of
Solution
Leaching is a process used for concentration of ore. In this process, a powdered ore is treated with a suitable reagent(such as acids, bases or other chemicals) which can selectively dissolve the ore, but not the impurities.
Which one of the following is an ore of silver ?
Solution
Argentite or silver glance )(Ag2S is an ore of Ag.
