Why roasting of copper pyrites is done?

Why is ferric chloride preferred over potassium chloride in case of cut leading to bleeding?

Lime stone is used in the manufacture of pig iron from haematite. Why?

Which reducing agent for the ore is used in the extraction of iron in the blast furnance ace?

Name any two ores of magnesium.

Write the names of materials mixed before the calcined ore is subjected for smelting in the extraction of iron. 

Name the two volatile metals.

Write the name of the iron obtained from the blast furnance?

In electrorefining of copper, where are the Ag and Au found?

How much pure is Blister Copper?