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.