Question

mention type of reaction when cupric ion convert into Cuprous ion

Answer 1

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At first glance, the many reactions that compounds and elements can undergo are overwhelming. How can such a variety be remembered or characterized? Fortunately, many of the important chemical reactions belong to one of four main types: (a) ion-combination reactions, also called metathetical or precipitation reactions, (b) proton-transfer reactions, also called Lowry-Bronsted acid-base reactions, (c) electron-sharing reactions, also known as Lewis acid-base reactions, and (d) electron-transfer reactions, more commonly known as oxidation-reduction reactions.

Ion-combination Reactions

Although both ionic and covalent compounds can undergo the latter three types of reactions, ion-combination reactions are usually confined to ionic compounds. This is also the simplest type of reaction. A simple ion-combination reaction takes place when a solution of silver nitrate is mixed with a solution of sodium chloride. Both solutions are colorless and clear, but when one is added to the other, a white precipitate forms. When subjected to chemical analysis, the white material can be shown to be silver chloride. Moreover, the solution that remains, which is called the filtrate, is a solution of sodium nitrate. The equation for the reaction therefore is:

NaCl + AgNO3  AgCl + NaNO3

This reaction comes to equilibrium, which is why we use double arrows.

Actually, it is more informative to write this equation in several other ways. First, we can show how the compounds exist in aqueous solution.

Na+(aq) + Cl-(aq) + Ag+(aq) + NO3-(aq) AgCl(s) + Na+(aq) + NO3-(aq)

Because both reactants are ionic, they enter the water solution as ions. The silver chloride is also ionic, but it is denoted with a subscript (s) to indicate that it exists primarily as a solid, even though some silver ions and chloride ions remain in solution when the reaction is complete.

We can also convert this ionic equation to a net ionic equation, which eliminates ions that really do not participate in the reaction. A look at the equation above shows that the sodium ions and nitrate ions appear in exactly the same form on both sides of the equation. These ions can be cancelled in the same way that x in the following equation can be cancelled:

10 + x = x + y

These ions are sometimes referred to as spectator ions because, in an anthropomorphic sense, they just "look on" while the silver ion and chloride ion participate in the reaction. After we cancel the sodium and nitrate ions, we obtain the net ionic equation:

Ag+(aq) + Cl-(aq)  AgCl(s)

Answer 2

Answer: Reduction

Explanation:

Cupric ion is copper in its higher oxidation state $Cu^{2+}$ and cuprous ion $Cu^+$ is copper in its lower oxidation state.

$Cu^{2+}+e^-\rightarrow Cu^+$

Thus in order to convert +2 oxidation state to +1 oxidation state, it needs to gain electron and thus the reaction is called as reduction reaction.