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C. Heating with carbon. D. Hating with sulphur. Solution: Reduction of an oxide by a substance depends on reducing ability of the substance. As Carbon (C) is more reductive than chromium oxide (Cr 2 O 3 ), it has more affinity towards oxygen. Therefore, zinc oxide can reduced to metal by heating with carbon but not chromium oxide. QUESTION: 3.

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Answer: d. Clarification: A high temperature of about 1100°C need to be maintained to keep the electrolyte in molten state but mixing the electrolyte with feldspar and cryolite brings down the temperature to about 940° – 980° C and also increases conductivity. 8. Electrochemical processes in metallurgy are spontaneous.

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