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JEE Main Chemistry question

ChemistryElectrochemistryJEE Main

Aluminium oxide may be electrolysed at to furnish aluminium metal (atomic mass = 27 u; 1 F = 96500 C). The cathode reaction is

To prepare 5.12 kg of aluminium metal by this method would require

Answer: (D)

Solution

Moles of Al . Since 3 mol electrons are needed per mol Al, moles of

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Question ID VK-143528