JUSTIFY ALONG IWTH NECESSARY CHEMICAL EQUATIONS:

a. Fe is more reactive than Cu hence replaces Cu from CuSO₄. Due to this reaction holes develop in Fe tank

Fe + CuSO₄ -----> FeSO₄ + Cu

while Ag is less reactive than Cu and can't replace Cu from CuSO₄. So CuSO₄ can be stored in Ag tank.

b. C₆H₁₂O₆ + 6O₂ ----- >  6CO₂ + 6H₂O + energy

energy released during formation of new bonds is more than energy required to break bonds in reactants. Thus energy is released during the reaction hence is exothermic.