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Why does the colour of copper sulphate solution change when!an iron nail is dipped in it?Give an example of a double displacement reaction other thanthe one given in Activity 1.10.Identify the substances that are oxidised and the substancesthat are reduced in the following reactions.(1) 4Na(s) + 0,(g) + 2Na, o(s)(ii) CuO(s) + H, (g) → Cu(s) + H,O(1)3. |
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Answer» Answer:When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore the colour of the copper sulphate solution changes.The reaction involved is The substance that added with oxygen is said to be oxidized whereas removal of oxygen is called as reduction and the substance is said to be reduced. So, we need to check the addition of oxygen or removal of oxygen to check the oxidation and reduction. (i) Na changes to Na2O . Hence, oxygen added so here Na oxidized and O2 reduced. (ii) CuO changes to Cu hence oxygen is removed from CuO. Hence, CuO is reduced and H2 is oxidized. Example of double displacement reaction: Bacl2 +Na2SO4 = BaSO4 +2NaCl |
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