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).

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