Isolation of Elements

The correct statement is :

In the extraction of copper from its sulphate ore, metal is finally obtained by the oxidation of cuprous sulphide with :

In the leaching method, bauxite ore is digested with a concentrated solution of NaOH that produces 'X'. When CO2 gas is passed through the aqueous solution of 'X', a hydrated compound 'Y' is precipitated. 'X' and 'Y' respectively are :

Extraction of copper by smelting uses silica as an additive to remove :

Which one of the following ores is best concentrated by froth floatation method?

In the context of the Hall-Heroult process for the extraction of Al, which of the following statements is
false?

Which method of purification is represented by the following equation :
Ti (s) + 2I2 (g) \(\buildrel {523K} \over \longrightarrow\) TiI4 (g) \(\buildrel {1700K} \over \longrightarrow\) Ti (s) + 2I2 (g)

Which of the following factors is of no significance for roasting sulphide ores to the oxides and not
subjecting the sulphide ores to carbon reduction directly?

During the process of electrolytic refining of copper, some metals present as impurity
settle as ‘anode mud’ These are

Which one of the following ores is best concentrated by froth – floatation method?

The metal extracted by leaching with a cyanide is

Aluminium is extracted by the electrolysis of