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(a) When sodium is brunt in chlorine, so...

(a) When sodium is brunt in chlorine, sodium chloride is formed, and when molten sodium chloride is electrolysed, then sodium and chorine are formed. What type of reaction takes place:
(i) in the first case ?
(ii) in the second case ?
(b) When hydrogen is prossed over heated copper oxide, copper and stem are formed. write a balanced chemical equation for this reaction. state which of the chemicals is oxidised and which is reduced ?
(c) what would you observe when zinc is added to a solution of iron sulphate ? write the chemical equation of the reaction which takes place. why does this reaction occur?

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