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InterviewSolution
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Why does the colour of copper sulphate solution change whenan iron nail is dipped in it?Give an example of a double displacement reaction other thanthe one given in Activity 1.10Identify the substances that are oxidised and the substancesthat are reduced in the following reactions.(i), 4Na(s) + O2(g) â 2Na,O(s)(ii) CuO(s) + H2(g) â Cu(s) + H2O(1) |
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Answer» 1)Answer: When an iron nail dipped in thecopper sulphatesolution than iron displacescopperfrom thecopper sulphatebecause iron is more reactive thancopper. Therefore thecolourof thecopper sulphatesolution changes 2)When lead (II) nitrate is mixed with potassium iodide, potassium nitrate and lead iodide are formed. Here sodium carbonate and calcium chloride exchange ions to form two new compounds. |
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