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CBSE Class X Science 2010 Question Paper with Solutions

Question : 1
Total: 27
Solution:
When iron nails are dipped in copper sulphate solution for about 30 minutes, iron nails become brownish in colour and the blue colour of copper sulphate solution fades and changes to light green.
Fe(s)+ CuSO4(aq) FeSO4(aq)+ Cu(s)
Iron
(Grey)
Copper
(Blue)

Iron sulphate
(Light green)
Copper
(Brown)
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