When Iron nails are added to an aqueous solution of copper sulphate, a chemical change occurs, which
of the following is not true about this reaction?
a)
Blue colour of the solution fades
b)
Iron nails become brownish in colour
c)
It is a displacement reaction
d)
Iron nails dissolves completely
Correct answer is option 'D'. Can you explain this answer?

Question

When Iron nails are added to an aqueous solution of copper sulphate, a chemical change occurs, which
of the following is not true about this reaction?

a)
Blue colour of the solution fades
b)
Iron nails become brownish in colour
c)
It is a displacement reaction
d)
Iron nails dissolves completely

Correct answer is option 'D'. Can you explain this answer?

Answer

Due to the high reactivity of iron , it displaces the copper from its solution to form a ferrous sulphate which is light green in colour.  According to question , correct answer is option 'd' .

Answer

When iron nails are dipped in aqueous solution of copper sulphate, ions of iron nails displaces the ions of copper sulphate as iron is more reactive than copper. The amount of copper displaced is equal to amount of iron dissolved and therefore iron nails do not get completely dissolved in the solution.

Answer

Here displacement reaction takes place .Copper which is present in CuSO4 deposits on iron nail and exactly same amount of iron dissolve in it.Hence iron nail does not dissolve completely in it.

Answer

Explanation:

When iron nails are added to an aqueous solution of copper sulphate, a chemical reaction takes place. Let's analyze each option to understand the true nature of the reaction and why option 'D' is incorrect.

a) Blue colour of the solution fades:
When iron nails are added to the copper sulphate solution, a displacement reaction occurs. Iron has a higher reactivity than copper, so it displaces copper from its compound (copper sulphate). As a result, copper ions are reduced to metallic copper, which appears as a brownish precipitate. The blue color of the copper sulphate solution fades as the copper ions are reduced and deposited as copper metal.

b) Iron nails become brownish in colour:
As mentioned earlier, the copper ions from the copper sulphate solution are reduced and deposited as copper metal. This deposition of copper on the surface of iron nails gives them a brownish color. This change in color of the iron nails is a clear indication of a chemical reaction taking place.

c) It is a displacement reaction:
The reaction between iron nails and copper sulphate indeed is a displacement reaction. Iron, which is more reactive, displaces copper from its compound. The iron atoms replace the copper atoms in the copper sulphate solution, resulting in the formation of iron sulphate and copper metal.

d) Iron nails dissolve completely:
This statement is not true. Iron nails do not dissolve completely when added to the copper sulphate solution. Instead, a chemical reaction occurs in which iron displaces copper from the solution, resulting in the formation of iron sulphate and the deposition of copper metal on the iron nails.

Therefore, the correct answer is option 'D' because iron nails do not dissolve completely in the aqueous solution of copper sulphate.

Answer

As iron is more reactive than copper, so iron displace copper from its salt solution. This is due to displacement reaction.Thus iron dissolves completely changing it from copper sulphate to ferrous sulphate.

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