Question

Q.17.Assertion : When iron nail is dipped in copper sulphate solution, the iron nail becomes brownish in colour and the blue colour of copper solution fade.Reason : Equation representing this change is Cu + FeSO4------> CuSO4 + Fe . *

1 point

(a) Both Assertion and Reason are True and Reason is the correct explanation of the Assertion.

(b) Both Assertion and Reason are True but Reason is not the Correct explanation of the Assertion

(c) Assertion is True but the Reason is False.

(d) Both Assertion and Reason are False.​

Answer 1

Answer:

a) both assertion and reason are true and reason is the correct explanation of the assertion

Explanation:

When an iron nail is dipped in a solution of CuSO4, it displaces copper from the Solution, which gets deposited or precipitated as a red or red-brown residue. Also the blue colour of the solution gradually fades.

Answer 2

Option (c) is correct as the Assertion is true but the reason is false.

Explanation

DISPLACEMENT REACTION -  

• The reaction in which the more reactive element replaced the other element in a compound.
• The new product formed in the chemical reaction shows changes in the physical and chemical properties.
• The reaction is also known as a replacement or exchange reaction.
• When an iron metal reacts with copper sulphate solution, iron displaces the copper metal forming the ferrous sulphate solution.
• In the reactivity series, iron metal is more reactive than copper.
• The blue color of the copper sulphate solution fades to brown color with the deposition of copper at the bottom.
• The reaction involved is -

                              $Fe + CuSO_4$ → $FeSO_4 + Cu$