Distinguish between roasting an calcination which of this is used for sulphide ore and why write a chemical equation to illustrate the use of aluminium for joining cracked railway lines name the anode the cathode and the electrolyte use in the electoralytic refining of impure copper
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roasting is heating up of ore at excess or precence of oxygen and calcination is heating of ore at abcense of oxygen.Roasting is used for sulphide ores for getting so4.
joining of railway tracks is called anodisation reaction.
Al2+Fe2(So4)3--------> Al2(So4)3+2Fe+heat. here iron is used for joining tracks.
anode is impure copper rod with impurities in it and cathode is pure copper rod with no impurities, the electrolyte is brime solution that is NaCl mixed with water.
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