A) Pure aluminium oxide is obtained by heating aluminium hydroxide.
B) Cryolite lowers down the melting temperature of bauxite in the electrolytic cell for extraction of aluminium.
C) Carbonate ores are converted into oxides by roasting ore in air.
D) Mercury cannot be produced by roasting the ore cinnabar in air.
Correct Answer: C
Solution :
Roasting process is commonly used for sulphide ores.
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