1.

Which of the following statement is incorrect?A. Pure aluminium oxide is obtained by heating aluminium hydroxideB. Cryolite lowers down the melting temperature of bauxite in the electrolytic cell for extraction of aluminiumC. Carbonate ores are converted into oxides by roasting the ore in airD. Mercury cannot be produced by roasting the ore of cinnabar in air

Answer» Correct Answer - C
Roasting process is commonly used for sulphide ores.


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