Question

23 Which term identifies the half-reaction that occurs at the anode of an operating electro­chemical cell?

Answer 1

Answer: The correct answer is Option 1.

Explanation:

Electrochemical cell is defined as the device that is used for the conversion of the chemical energy produced in a redox reaction into the electrical energy. In this cell, oxidation reaction occurs at anode and reduction reaction occurs at cathode.

For the given options:

Option 1: Oxidation reaction

Oxidation reaction is defined as the chemical reaction where a substance looses its electrons. The oxidation state of this substance gets increased and the substance gets oxidized.

$X\rightarrow X^{n+}+ne^-$

Option 2: Reduction reaction

Reduction reaction is defined as the chemical reaction where a substance gains electrons. The oxidation state of this substance gets reduced and the substance gets reduced.

$X^{n+}+ne^-\rightarrow X$

Option 3: Neutralization reaction

Neutralization reaction is defined as the chemical reaction where an acid reacts with a base to produce a salt and water molecule.

$HX+BOH\rightarrow BX+H_2O$

Option 4: Transmutation

This is defined as the process in which a nucleus is converted to another nucleus.

From the above information, at anode, oxidation reaction occurs. Thus, the correct answer is option 1.

Answer 2

Oxidisation is the loss of electrons
Reduction is the gain of electrons
Neutralisation is the mix of acids and alkalis
Transmutation is the changing of an element from one to another.
The Anode is the positive electrode.
At the positive electrode, electrons are lost
So the process is Reduction (2)