Which of the following statement is incorrect?

Options

A. Pure aluminium oxide is obtained by heating aluminium hydroxide
B. Cryolite lowers down the melting point of bauxite in electrolytic cell for extraction of aluminium
C. Carbonate ores are converted into oxides by roasting in air
D. Mercury cannot be produced by roasting the cinnabar ore in air

Answer

C

Explanation

Roasting is commonly used for sulphide ores.