SELECT * FROM question_mgmt as q WHERE id=3488 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=9 AND subId=16 AND chapterId=252 and ex_no='3' AND status=1 ORDER BY CAST(question_no AS UNSIGNED) CBSE Free NCERT Solution of 10th science Chemical reaction and Equation why does the colour of copper sulphate solution ch

Question:

Why does the colour of copper sulphate solution change when an iron nail is dipped in it?

Answer:

       Fe (s)        +         CuSO4 (aq)          ----→          FeSO4 (aq)                +          Cu(s)

       Iron                  Copper Sulphate                      Ferrous Suplhate                  Copper

Displacement reaction occurs. As Iron is more reactive than copper, iron displace copper from copper sulphate and forms ferrous sulphate, which is light green colour compared to dark blue colour solution of copper sulphate.


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