Shaleen sir has asked a brain treasure at the end of the exam decoded section . the question is what happens to the potential energy of the compressed spring dissolve in acid?

As acid dissolves any metal, there is an exchange of energy. The atoms in the outer layer of the spring contain potential energy, and that energy is released when the acid releases the atoms more easily than would otherwise be the case. So, the dissolving process absorbs the potential energy of the compressed spring.