Question

18. An iron nail was dipped in a salt
solution. After sometime a reddish
brown deposition appears on the
nail. The salt solution is
silver nitrate
sodium phosphate
O copper sulphate
O
common salt solution​

Answer 1

Answer:

copper sulphate

Explanation:

copper sulphate

Answer 2

Answer:

The answer is Copper Sulphate solution- In which the copper present in the solution is responsible for the reddish brown deposition on the nail.

Explanation:

From the above question we can see that

Given:

Iron nail- dipped in a salt solution

To find:

The salt solution

Solution:

Silver nitrate solution- when iron nail is dissolved in silver nitrate, iron being more reactive displaces the silver from its component. This reaction will give a silver colour to the nail.

Sodium Phosphate solution: No such adverse reaction occurs with this solution.

Copper Sulphate: Now, if iron nail is dissolved in this solution a redox reaction occurs, that is there is transfer of electrons between the reactions that takes place.

Here, also since the iron is more reactive than copper it displaces copper from the solution(CuSo4) and forms iron sulphate(FeSo4) and the Copper which is displaced in turn gets deposited on the surface of the nail, which is a reddish brown deposition.

Therefore, the answer is copper sulphate.

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