(a) Explain two ways by which food industries prevent rancidity. (b) Discuss the importance of decomposition reaction in metal industry with three points. -Chemistry

(a) Explain two ways by which food industries prevent rancidity. (b) Discuss the importance of decomposition reaction in metal industry with three points. -Chemistry
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Answer. (a) (i) Rancidity can be prevented by adding antioxidants to food containing fat and oil, e.g. butylated hydroxy anisole is added to butter as antioxidant. (ii) It can be prevented by packaging fat and oil containing foods in nitrogen gas. (b) (i) Molten NaCl is electrolytically decomposed to form sodium metal. (ii) Aluminium metal is obtained by electric decomposition of bauxite ore mixed with cryolite. (iii) Carbonate ores are thermally decomposed to give metal oxide which on reduction give metal.
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