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Why does the colour of copper sulphate solution change when an iron nail is dipped in it?
When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour.
Therefore, the blue colour of copper sulphate solution fades and green colour appears.
Give an example of a double displacement reaction other than the one given in Activity 1.10.
Sodium carbonate reacts with calcium chloride to form calcium carbonate and sodium chloride.
In this reaction, sodium carbonate and calcium chloride exchange ions to form two new compounds. Hence, it is a double displacement reaction.
Identify the substances that are oxidised and the substances that are reduced in the following reactions.
(i)
(ii) 
(i) Addition of oxygen into Na is taking place. hence Na is oxidised into NaO. oxygen gets reduced
(ii) Removal of oxygen from CuO and addition of oxygen into hydrogen is taking place. hence CuO get reduced and Hydrogen gets oxidised
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