On immersing the brow coloured iron nails in blue coliured copper sulphate solution they display ..... From the copper sulphate solution and their colour becomes ..... Tgis is a reaction.....
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double displacement reaction
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The ferrous sulphate crystals are light green in colour. The gas emitted has the characteristic odour of burning sulphur. On heating, the colour changes from light green to white. On further heating, the white substance changes to do
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