Tamil Nadu HSC (Class 12) Metallurgy — practice questions
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Practice Tamil Nadu HSC (Class 12) Metallurgy in the app →A naturally occurring substance from which a metal can be extracted profitably and economically is calledThe composition of the aluminium ore bauxite isThe rocky and siliceous non-metallic impurities associated with an ore are collectively calledFroth flotation is the method of choice for concentratingRoasting of a sulphide ore in excess air always evolves a colourless gas whose aqueous solution is acidic. TheWhich reaction represents calcination?The metal extracted industrially by the Hall–Héroult electrolytic process isMetallic zinc coated on iron to protect it from rusting illustrates the process calledDuring froth flotation of galena (PbS) contaminated with zinc blende (ZnS), sodium cyanide is added. Its role Wolframite impurity is removed from tin stone (cassiterite) byWhich one of the following metal oxides CANNOT be reduced to the metal by heating with carbon?In the smelting of haematite in the blast furnace, limestone is added mainly toBlister copper obtained in the bessemerisation step has a blistered appearance becauseCinnabar (HgS) is unusual because mercury can be obtained from it simply byIn the thermite (aluminothermic) process, chromium is obtained from chromic oxide becauseIn the Hall–Héroult process, cryolite ($Na_3AlF_6$) is added to alumina toIn the electrolytic refining of copper, the anode and cathode are respectivelyIn the cyanide process, gold is recovered from the leached solution $[Au(CN)_2]^-$ by adding zinc. This recoveAn Ellingham diagram is a plot ofIn an Ellingham diagram the line for the formation of carbon monoxide ($2C + O_2
ightarrow 2CO$) has a negatiFrom an Ellingham diagram, aluminium can reduce which of the following oxides?From an Ellingham diagram at 1500 K, $\Delta G^\circ$ for $2Fe+O_2\rightarrow 2FeO$ is $-350$ kJ and for $2C+ONickel is refined by heating the impure metal in a stream of CO to form a volatile carbonyl which is then decoGermanium and silicon used as semiconductors are purified by zone refining because