Question

Give some information $\rm{CuSO_4(aq)+Fe(s)\longrightarrow{}\underset{\text{pale green}}{FeSO_4(aq)}+Cu(s)}$​

Answer 1

• The blue colour of aqueous copper sulphate solution can be changed to place green by immersing an iron rod in it.

Explanation:

• Out of the given options, all except silver can displace copper from its solution. But, we are also asked that the solution should be changed to a colour of pale-green. Hence, the answer is iron beacuse the colour of iron sulphate solution is pale-green.
• When an iron rod is immersed in the copper sulphate solution it displaces copper from its solution and forms iron sulphate solution which gives a pale green colour to the resultant solution.

Reaction:

$\rm{CuSO_4(aq)+Fe(s)\longrightarrow{}\underset{\text{pale green}}{FeSO_4(aq)}+Cu(s)}$

Additional Information:

Displacement reaction:

A type of chemical reaction in which an atom or group of atoms displace another atom or group of atoms of a compound. Displacement reactions are also called single-displacement reactions.

Examples:

1. $\rm{CuCl_2(aq)+Zn(s)\longrightarrow{}ZnCl_2(aq)+Cu(s)}$
2. $\rm{CuSO_4(aq)+Zn(s)\longrightarrow{}ZnSO_4(aq)+Cu(s)}$
3. $\rm{CuCl_2(aq)+Pb(s)\longrightarrow{}PbCl_2(aq)+Cu(s)}$

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