The process of heating an ore in the presence of excess air to a temperature below its melting point is called:

Explain the isolation of metals from concentrated ore.

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

Given below are two statements:
Statement-$I$ : In the metallurgy process,sulphide ore is converted to oxide before reduction.
Statement-$II$ : Oxide ores in general are easier to reduce.
In the light of the above statements,choose the most appropriate answer from the options given below :

Explain Calcination and Roasting in detail.

Calcination is the process in which