Question

During electrolysis, the reaction takes place at cathode------.
A.Oxidation
B.Reduction
C.Decomposition
D.Redox

Answer 1

Hint: The chemical reaction preceded by chemical changes when we pass electrical energy from any external source is commonly known as electrolysis.
In this process electrical energy is converted into chemical energy to produce different products.

Complete answer:
Let's consider a chemical reaction between zinc sulphate and copper sulphate .
When we take both these reactants in a galvanic cell and apply electric current between two electrodes ions produced in the chemical reaction moves towards the electrodes.
During this reaction, zinc is oxidized to its ion in the presence of electricity .
$Z{n_{\left( s \right)}} \to Z{n^{ + 2}}_{\left( {aq} \right)} + 2{e^ - }$
As we know the loss of electrons is known as oxidation; it means that zinc undergoes an oxidation process.
The electrode where electrons are released or the process of oxidation takes place is known as Anode.
Electrons released into the system during oxidation at anode are taken up by $C{u^{ + 2}}$ions to form solid copper.
$C{u^{ + 2}}_{\left( {aq} \right)} + 2{e^ - } \to C{u_{\left( s \right)}}$
As we know acceptance of electrons is commonly known as reduction it means that copper undergoes a reduction process during electrolysis.
The electrode where electrons are accepted or the process of reduction takes place is known as Cathode.
Hence, from the above chemical reaction we concluded that the process of reduction takes place at cathode so option $\left( {ii} \right)$ is the correct option.

Note:
Electrons move from anode to cathode hence, electric flows from cathode to anode, opposite to the direction of flow of electrons.
A Galvanic cell is defined as a system which is used to generate electrical energy produced from chemical reaction.