Four different experiments were conducted by students of class X.
I. Navin took a beaker containing some aqueous solution of CuSO_4 and added a piece of magnesium strip in it.
II. Ayush took a beaker containing some aqueous solution of CuSO_4 and added some platinum pieces in it.
III. Sneha took a beaker containing some aqueous solution CuSO_4 and added some copper turnings in it.
IV. Akriti took a beaker containing some aqueous solution CuSO_4 and added a piece of silver wire in it
Who among them was able to perform a displacement reaction?

Correct option is C

I. Navin's experiment:​

Navin  added a piece of magnesium strip to an aqueous solution of copper sulfate (CuSO₄). Magnesium (Mg) is more reactive than copper (Cu), so it will displace copper from copper sulfate, resulting in a displacement reaction. The reaction will be:
​
This is a displacement reaction.

II. Ayush's experiment:
Ayush added platinum pieces to an aqueous solution of CuSO₄. Platinum is an inert metal and does not react with copper sulfate. Hence, no reaction occurs.
This is not a displacement reaction.

III. Sneha's experiment:
Sneha added copper turnings to an aqueous solution of Cu SO₄. Copper is the same as the metal already present in the solution (Cu²⁺ ions), so no displacement can occur.
This is not a displacement reaction.

IV. Akriti's experiment:
Akriti added a piece of silver wire to an aqueous solution of Cu SO₄. Silver (Ag) is less reactive than copper, so it cannot displace copper from copper sulfate.
This is not a displacement reaction.