About displacement of a metal solution?

Why effervescence occur during displacement of a metal solution say copper (II) sulphate by zinc metal? Pls explain in details

Effervescence is the escape of gas from an aqueous solution. The term is usually used to describe the foaming or fizzing that results from gas
So i think you got effervescence mix up with precipitation because displacement do not give out any gas
however when u add acid to any carbonate or any metal effervescence will occur due to gas surfacing
When a more active metal replaces another metal, depending on the other ion, a gas can be released.

CuSO4 + Zn ---> ZnSO4 + Cu, usually

Perhaps you are seeing air bubbles , ometimes the solution gets warm.
the only reason i can think of is that since the CuSO4 solution is acidic (CuOH is a weak base, H2SO4 a strong acid, therefore CuSO4 hydrolyzes partially in water and gives an acidic solution) and Zn reacts with it, to give off hydrogen.
When copper is displaced by zinc, which is more active, energy is liberated in heat form. No gas is evolved. When you are talking of diplacement, the term itself explains this phenomena.

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