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Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process? (b) Name the chemical compound which is electrolysed in molten state to obtain sodium metal.

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(a) Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?

(b) Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?

(c) Name the gas produced when calamine ore is calcined.

(d) Name the gas evolved when cinnabar ore is roasted..

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(a) Aluminium oxide is electrolysed in molten state to obtain aluminium metal. Oxygen gas is evolved during the process.

(b) Sodium chloride is electrolysed in molten state to obtain sodium metal. Chlorine gas is evolved during this process.

(c) Carbon dioxide is produced when calamine ore is calcined.

(d) Sulphur dioxide gas is evolved when cinnabar ore is roasted.

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