The reaction $2ZnS + 3O_2 \to 2ZnO + 2SO_2$ in the metallurgical process of zinc is called:

Select the correct statement:

Zinc is obtained from zinc blende by:

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

Consider the following statements:
Roasting is carried out to:
$(i)$ convert sulphide to oxide and sulphate
$(ii)$ remove water of hydration
$(iii)$ melt the ore
$(iv)$ remove arsenic and sulphur impurities
Of these statements:

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