Question

Complete the following table of displacement reaction. Identify oxidising and reducing agents involved.

Reactants	Products
1. Zn\left( S \right) + \,\\_\\_\\_\\_\\_\left( {aq} \right)	\\_\\_\\_\\_\\_\left( {aq} \right) + Cu\left( S \right)
2. $Cu\left( S \right) + 2A{g^ + }\left( {aq} \right)$	\\_\\_\\_\\_ + \\_\\_\\_\\_

Answer 1

Hint : When the ions of a metal higher in the electrochemical series are combined with the ions of a metal lower in the electrochemical series, displacement reactions occur. The more reactive metal's atoms force their electrons onto the less reactive metal's ions.

Complete Step By Step Answer:
Reduction and oxidation (redox) reactions are chemical reactions that involve the exchange of electrons. When a chemical species loses electrons, it is said to be oxidised, and when it receives electrons, it is said to be reduced.
Now, coming to the question:
1. Zn\left( S \right) + \,\\_\\_\\_\\_\\_\left( {aq} \right) \to \\_\\_\\_\\_\left( {aq} \right) + Cu\left( S \right)
In this reaction because zinc has a higher reactivity than copper, it replaces copper in a copper sulphate $\left( {CuS{O_4}} \right)$ solution and creates zinc sulphate. The colour of the solution changes from blue to colourless during the operation.
The chemical equation of the reaction;
$Zn{\text{ }} + {\text{ }}CuS{O_4}\; \to {\text{ }}ZnS{O_4}\; + {\text{ }}Cu$
So, in this displacement reaction Copper sulphate $(CuS{O_4})$ acts as an oxidising agent by supplying oxygen to zinc, whereas zinc acts as a reducing agent by absorbing oxygen.
2. Cu\left( S \right) + 2A{g^ + }\left( {aq} \right) \to \\_\\_\\_\\_ + \\_\\_\\_\\_
In solution, copper metal became copper ions, while silver ions created silver metal.
$Cu\left( s \right){\text{ }} + {\text{ 2}}A{g^ + }\left( {aq} \right)\; \to \;C{u^{2 + }}\left( {aq} \right){\text{ }} + {\text{ 2}}Ag\left( s \right)\;$
$Cu\left( s \right)$ ions lose electrons to become $C{u^{2 + }}\left( {aq} \right)$ ions, while $A{g^ + }\left( {aq} \right)$ ions gain electrons to become $A{g^ + }\left( {aq} \right)$ ions . The $Cu\left( s \right)$ loses electrons to be oxidized to $C{u^{2 + }}\left( {aq} \right)$ . The $A{g^ + }\left( {aq} \right)$ gain electrons to be reduced to $Ag\left( s \right).$

Note :
If the standard electrode potential for the redox reaction $,{\text{ }}{E_{0\,\left( {\operatorname{Re} dox\,\,reaction} \right)}}$ , is positive, the redox reaction is spontaneous. The reaction will move forward if $,{\text{ }}{E_{0\,\left( {\operatorname{Re} dox\,\,reaction} \right)}}$ is positive (spontaneous). We wouldn't anticipate the reverse reaction to be spontaneous after observing the spontaneous reaction of $A{g^ + }$and $Cu$ . As a result, there is no interaction between $Ag$ metal and$C{u_2}^ +$.