For the metallurgical process of which of the ores calcined ore can be reduced by carbon?

For the metallurgical process of the ores calcined ore can be reduced by carbon ?

In metallurgy, which of the following ores are reduced by carbon after calcination -

Benefication of the ore can be done by different ways. It is increasing the concentration of ore by removing impurities, while refining is the process by which concentration of metal is incresed in the final product. Which of the following compound will be reduced by carbon reduction?

Which of the pairs of ores are carbonate ores ?

Which of the following is carbonate ore?

Formation of metallie copper from the sulphide ore in the normal thermo-metallurgical process essentially involves which one of the following reaction?