Respuesta :
Answer:
D) Mn + Ni2+ ⇒ Mn2+ + Ni
Explanation:
A spontaneous process is capable of proceeding in a given direction without needing to be driven by an outside source of energy. A Spontaneous reaction takes place on its own without external influences. In a spontaneous reaction, this change in entropy is positive (ΔS) , the change in enthalpy is negative (ΔH) and most importantly the
value of ΔG(change is free energy) is negative.
In order to decide the spontaneous reaction among the options, we consider the relative electrode potentials of the reaction species. The specie having a more negative reduction potential can displace the other specie from its aqueous solution. Since the reduction potential of Mn^2+ is -1.19 V while that of nickel is -0.25 V, it follows that manganese can spontaneously displace Ni^2+ from its aqueous solution as shown in the answer above.
The reaction involves the interaction between the reactant(s) to form the product(s). The fourth equation involving manganese and nickel is a spontaneous reaction. Thus, option D is correct.
What is a spontaneous reaction?
A spontaneous reaction is the product formation at the same time the reactants are changing. It generally involves the release of the energy and does not need external energy.
In the fourth reaction, the reduction potential of manganese is more than the nickel and can easily replace by the aqueous solution without requiring energy from an external source.
Therefore, option D. Mn + Ni²⁺ ⇒ Mn²⁺ + Ni is a spontaneous reaction.
Learn more about the spontaneous reaction here:
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