The quantity of charge required to obtain one mole of aluminium from Al₂O₃ is ___________.

The quantity of electricity passed in a circuit is given by the formula

Q = It

Where,

Q is the charge developed in the circuit,

I is the current in the circuit in amperes,

t is the time period for which current is allowed to pass through in the circuit.

Electrolysis of Al₂O₃ gives Al³⁺, which can be reduced to Al(s) by 3 moles of electrons. 1 Faraday or 1F is the charge on one mole of electrons.

The charge on one electron is 1.6 × 10^-19C. Charge on a mole of electrons is 1.6 × 10^-19 C × 6.023 × 10²³ mol^-1 = 96487 C mol^-1.

Thus, for three moles of aluminum, 3F of charge is required. The correct option is (iii).