(i) write the principle of method used for the refining of germanium.

1.	(i) write the principle of method used for the refining of germanium. (ii) Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferubly? (iii) What is the significance of leaching in the extraction of aluminium ?
Answer» (i) The impurities are more soluble in the melt than in the solid state of the metal. (ii) PbS (iii) Impurities like SiO₂ etc. are removed by using NaOH Solution and pure alumina is obtained.

(i) write the principle of method used for the refining of germanium. (ii) Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferubly? (iii) What is the significance of leaching in the extraction of aluminium ?

Answer»

(i) The impurities are more soluble in the melt than in the solid state of the metal.

(ii) PbS

(iii) Impurities like SiO₂ etc. are removed by using NaOH Solution and pure alumina is obtained.