what do you understand by corrotion write any two method to reduce corrotion of iron
Answers
(a) The unwanted reaction of any metal with its surroundings that deteriorate its qualities is called corrosion. Two methods to prevent corrosion is painting the metal or alloying it with some other metal in an appropriate ratio.
(b) The first step is to separate dust like and other such physical impurities from the ore. The process is called concentration of the ore. Then following steps are carried out.
First of all sulfide ores are subjected ti roasting which converts them into metal oxides.
MS+O
2
→
△
MO+SO
2
→ Roasting (heating in excess air)
The metal oxide is then heated with carbon or coke which is a good reducing agent and converts oxide into pure metal.
MO+C
→
△
CO
2
+M→ Reduction with coke.
The pure metal is then refined to get an ultra-pure metal.