a) A solution of substance ‘X’ is used for white washing. What is the substance ‘X’? State the chemical reaction of ‘X’ with water. (b) Why does the colour of copper sulphate solution change when an iron nail is dipped in it? *
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The substance 'X' which is used in white washing is calcium oxide or quick lime and its formula is CaO. B - 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
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