Question

Arun places a piece of aluminum metal in a test tube of copper sulfate
A reaction takes place
the word equation for this reaction is
aluminum->+ copper sulfate-> aluminium sulfate+ copper
a) how can Arun tell that a reaction has taken place?
b) why this reaction is called a displacement reaction?
c) arun then places some zinc in a solution of lead nitrate. A displacement reaction is taken place. write a word equation for this
d) he then places some copper into a solution of sodium chloride. No reaction has taken place give a reason for your answer?

Answer 1

Answer: Required Answer:-

Rafa places a piece of Aluminium metal in a test tube containing copper sulphate solution.

a. Rafa can tell that a reaction has taken place by observing the followings:-

• The blue colour of copper sulphate solution fades away and becomes colourless.

• A brown layer of copper gets deposited on the surface of the aluminium metal.

b. This reaction is called as displacement reaction because here a more reactive metal (i.e. Aluminium) displaces a less reactive metal (i.e. copper) in a solution.

The equation of this reaction can be written as:-

Al + CuSO₄ ⟶ Al₂(SO₄)₃ + Cu

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Extra!

⇒ What is displacement reaction?

✓ Displacement reaction is a reaction in which a more reactive metal displaces a less reactive metal in a solution.

Some other examples of displacement reaction:-

• Na + CuSO₄ ⟶ Na₂SO₄ + Cu

• K + ZnSO₄ ⟶ K₂SO₄ + Zn

• Fe + CuSO₄ ⟶ FeSO₄

• Na + HCl ⟶ NaCl + H₂

Explanation: