Question

Oxygen gas is liberated at the _____ (negative / positive) electrode called the ___.

Answer 1

Hint: An electrode is known as any substance which is a good conductor of electricity and they connect non – metallic parts of the circuits. An electrode is of two types, known as cathode and anode.

Complete answer:
An electrode is a conductor which helps in establishing the electrical connection with a no – metal part of the circuit. Cathode and anode are described by the direction of the flow of the current.
The cathode is defined as the current which leaves the electrodes or cathode, and is a result of reduction reaction taking place in an electrolyte mixture. In this process the electrons are released from the electrode and the surrounding solution is reduced. A cathode is regarded as having a positive charge in a galvanic cell
In an anode electrode the electricity moves in. An anode is a positive side, and it acts as an electron donor. In an electrolytic cell, oxidation reaction takes place at the anode. An anode is regarded as having a negative charge in a galvanic cell.
Thus, the ‘ ${O^{ - 2}}$’ ions are oxidized to produce ‘${O_2}$’ gas at the positive electrode which is known as the anode.
Hence, oxygen gas is liberated at the positive electrode called anode.

Note:
Electrodes are further classified as reactive and inert electrodes. An inert electrode does not participate in any reaction, while a reactive electrode participates actively in reactions.
Electrodes are used to generate electrical current and are used to measure conductivity. It is also used in different batteries, electroplating, electrolysis and for chemical analysis.