Question

The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is: 

• A. Blue
• B. Pale green
• C. Yellow
• D. Reddish brown
  {5pt}

Hint:

In displacement reactions, a more reactive metal can displace a less reactive metal from its salt solution.

Answer 1

The Correct Option is B

Step 1: Iron nails react with copper sulfate. Iron nails immersed in a copper sulfate solution undergo a displacement reaction. Iron replaces copper in the salt, yielding iron(II) sulfate and copper.
Step 2: Outcome. The solution's color shifts to pale green, signifying iron(II) sulfate formation.