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When a metal X is placed in blue vitriol solution it change blue color solution into green and a red-brown coating of metal Y is formed on metal X. Metal X and Y are:

When a metal X is placed in blue vitriol solution it change blue color solution into green and a red-brown coating of metal Y is formed on metal X. Metal X and Y are: Correct Answer Iron, Copper

 

Concept:

Displacement Reaction:

  • A displacement reaction is a type of reaction in which part of one reactant is replaced by another reactant.                                                
  • An example of the reaction of Iron with copper sulphate solution:

 Fe + CuSO4 → FeSO4 + Cu

  • ​Displacement reaction can occur if metal reacting is more reactive than the metal which it have to replace in solution. 
  • The above reaction is possible because Iron is more reactive than Copper. 
  • The reactivity is determined by the reactivity series. 

Reactivity Series

  • The metals are arranged in an activity order that is known as the metal activity series.
  • The more active metals are present at the top of the series whereas the less active metals are put at the end of the series.
  • The metal activity series is as follows- 

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Explanation:​

  • Copper sulphate is called blue vitriol. 
  • Iron reacts with copper sulphate and form ferrous sulphate. 
  • So, X is iron and Y is copper. 
  • The coating of displaced copper is formed on iron. 

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