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.

1. The most reactive metal is K and the 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. The equation is given as: $Fe + CuSO_4 \rightarrow FeSO_4 + Cu$

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Updated on: 17-Mar-2023

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