Why is the electrolytic cell made of silica ?

What is an electrolytic cell?

In the electrolytic cell, flow of electrons is form :

In an electrolytic cell current flows

What is a secondary cell made of?

Do the electrodes in an electrolytic cell have fixed polarity like a battery?

Which is the crystalline form of silica

What will be PH of aqueous solution of electrolyte in electrolytic cell during electrolysis of CuSO_(4) (Aq) between graphite electrodes ?

Three different electrolytic cells A, B and C are connected in separate circuits. Electrolytic cell A contains sodium chloride solution. When the circuit is completed, a bulb in the circuit glows brightly. Electrolytic cell B contains acetic acid solution and in this case the bulb in the circuit glows dimly. The electrolytic cell C contains sugаr solution and the bulb does not glow. Give a reason for each of these observations.

The following is a sketch of an electrolytic cell used in the extraction of aluminium. What is the substance of which the electrode A and B are made ?

The following is a sketch of an electrolytic cell used in the extraction of aluminium. Why is it necessary for electrode B to be continuously replaced ?