question_answer

Assertion (A): When soft iron nails are dipped in a strong solution of copper sulphate, a greenish black solution is formed. Reason (R): Iron replaces copper from copper sulphate solution forming iron sulphate. (a) Both Assertion and Reason are correct and Reason is the correct explanation of Assertion. (b) Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion. (c) Assertion is correct and Reason is incorrect. (d) Assertion is incorrect and Reason is correct

Answer:

We know that a highly reactive metal displaces a less reactive metal from its solution. Iron is more reactive and it displaces copper from its solution. \[\underset{\left( \begin{smallmatrix}  Copper\text{ }sulphate \\  solution \end{smallmatrix} \right)}{\mathop{CuS{{O}_{4}}}}\,+\underset{(Iron)}{\mathop{Fe}}\,\xrightarrow{{}}\underset{\left( Iron\,sulphate \right)}{\mathop{FeS{{O}_{4}}}}\,+\underset{(Copper)}{\mathop{Cu}}\,\]