Question

The blue colour of aqueous copper sulphate solution

can be changed to pale green by immersing which of

the following metal rod in it ?

(a) Iron
(b) Zinc

(c) Aluminium
(d) Silver​

Answer 1

Answer:

• Iron. 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:

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

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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:

• $\rm{CuCl_2(aq)+Zn(s)\longrightarrow{}ZnCl_2(aq)+Cu(s)}$
• $\rm{CuSO_4(aq)+Zn(s)\longrightarrow{}ZnSO_4(aq)+Cu(s)}$
• $\rm{CuCl_2(aq)+Pb(s)\longrightarrow{}PbCl_2(aq)+Cu(s)}$

Answer 2

$\bigstar$ Solution :

$\bigstar$ Question :

• The blue color of aqueous copper sulphate solution   can be changed to pale green by immersing which of  the following metal rod in it ?

     (a) Iron

     (b) Zinc  

     (c) Aluminium

     (d) Silver​

$\bigstar$ Answer :

• (a). Iron ( Fe )
• The blue color of aqueous copper sulphate solution can be changed to pace green by immersing an iron rod in it.

$\bigstar$ Reaction :

• $CuSO_4(aq)+Fe(s)\rightarrow FeSO_4(aq)[Pale green]+Cu(s)$

$\bigstar$ Explanation :

→ From the  given options, all metals 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 because the colour of iron sulphate solution is pale-green.

→ When Iron is dipped in copper sulphate solution its colour changes from blue to pale green. Iron is more reactive than copper, So it displaces copper from copper sulphate solution and the solution becomes iron sulphate solution with some amount of copper. This reaction is known as displacement Reaction.

                                                                                                           

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