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1) Identify the most reactive and least reactive metal amongst the followings : Al, K, Cu, Au. 2) An iron knife kept dipped in blue copper sulphate solution changes to light green. Why ? Write the equation also. [KVS 2005]

1) Identify the most reactive and least reactive metal amongst the followings :
Al, K, Cu, Au.
2) An iron knife kept dipped in blue copper sulphate solution changes to light green. Why ? Write the equation also. [KVS 2005]

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60787 Points
3 years ago
1) Most reactive metal is K and least reactive metal is Au. 2) An iron knife kept dipped in blue copper sulphate solution changes to light green because iron replaces copper from copper sulphate and forms iron sulphate. This happens because iron is more reactive than copper. Fe + CuSO4 ——> FeSO4 + Cu

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