Question

A farmer prepared 1% solution of Copper sulphate using iron rod as the stirror for   

      preparing  Bordeaux  mixture .Next  day he  noticed  that  the  blue  colour almost 

     disappeared and the iron got coated with reddish brown material. What is the 

    reddish brown material deposited on iron rod and justify that the above phenomenon   

    is a redox reaction.​

Answer 1

Answer:

D

Iron nails dissolve completely

Fe(s)+CuSO

4

⟶Cu(s)+FeSO

4

When an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed on the surface of iron and the colour of copper sulphate solution changes from blue to light green. This reaction shows that iron is more reactive than copper as it displaces copper from its solution and iron passes into solution as Fe

2+

ions and ferrous sulphate solution is formed.