The process of converting hydrated alumina into anhydrous alumina is known as .......

What is the process of heating pyrites to remove sulfur called?

The processes of calcination and roasting in metallurgical industries,respectively,can lead to :-

Roasting of sulphides gives the gas $X$ as a byproduct. This is a colourless gas with a choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic,acts as a reducing agent,and its acid has never been isolated.
The gas $X$ is

$A$ sulphide ore is first converted into its oxide before reduction. This is done because

Which of the following reactions occurring in a blast furnace is endothermic?