Graphite electrodes inert

Graphite electrodes are  inert electrodes  because they do not participate in any chemical reactions.
Graphite electrodes inert
An inert electrode that does not gain or lose electrons and does not react with an electrolyte solution.
Graphite electrodes are inert at room temperature, but they are oxidized at high temperatures. So in an arc furnace at 3000°C, the graphite electrode will be slowly consumed. In general, 2 kg of graphite electrodes are consumed to smelt 1 ton of steel.
Inert electrodes meaning
Inert electrode (C, Pt, etc.): only conducts electricity, does not participate in the reaction.
The electrode itself is very weak and does not react. Except for graphite, platinum, etc., general metals are not inert electrodes.
Inert electrodes examples
An inert electrode refers to an electrode that is stable in an electrolyte solution. It does not react with or is difficult to react with electrolyte. Mainly gold, silver, platinum, mercury, graphite, etc.
Inert electrodes in electrolysis
Generally used on the anode, because the anode generally has oxidizing things during electrolysis, so in order to avoid corrosion, it is necessary to use inert electrodes that are difficult to react.

A: Cu2++2e-==Cu
B: 2C1--2e-==C12↑
C: 2Ag++2e-==2Ag
D: 4OH--4e-==2H2O+O2
The ratio of the amount of substances electrolyzing the products on each electrode of A, B, C, D is 2∶2∶4∶1.
Electrolysis: The process of causing current to flow through the electrolyte and causing redox reactions at the anode and cathode is called electrolysis.