- - - - . In the extraction of aluminium from alumina by electrolysis, cryolite is added to a) Lower the melting point of alumina b) Remove impurities from alumina c) Decrease the electrical conductivity d) Increase the rate of reduction . Zinc is obtained from ZnO by a) Carbon reduction b) Reduction using silver c) Electrochemical process d) Acid leaching . Extraction of gold and silver involves leaching with cyanide ion.
silver is later recovered by (NEET- ) a) Distillation b) Zone refining c) Displacement with zinc d) liquation . Considering Ellingham diagram, which of the following metals can be used to reduce alumina? (NEET- ) a) Fe b) Cu c) Mg d) Zn . The following set of reactions are used in refining Zirconium Zr (impure) + 2I ZrI ZrI Zr (pure) + 2I K 1800K → → This method is known as a) Liquation b) Van Arkel process c) Zone refining d) Mond’s process .
Which of the following is used for concentrating ore in metallurgy? a) Leaching b) Roasting c) Froth floatation d) Both (a) and (c) . The incorrect statement among the following is a) Nickel is refined by Mond’s process b) Titanium is refined by Van Arkel’s process c) Zinc blende is concentrated by froth floatation d) In the metallurgy of gold, the metal is leached with dilute sodium chloride solution . In the electrolytic refining of copper, which one of the following is used as anode?
a) Pure copper b) Impure copper c) Carbon rod d) Platinum electrode XII U1 Metallurgy - XII U1 Metallurgy - - - - - . Which of the following plot gives Ellingham diagram a) Δ S Vs T b) Δ G Vs T