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Question

Chemistry Question on Concentration of ores

Which of the following statements is incorrect?

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.

Answer

Carbonate ores are converted into oxides by roasting ore in air.

Explanation

Solution

Roasting process is commonly used for sulphide ores.