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MHT CET Chemistry question

ChemistryElectrochemistryMHT CET

Aluminium oxide may be electrolysed at 1000℃ to furnish aluminium metal (At. Mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is . To prepare 5.12 kg of aluminium metal by this method would require of electricity [AIEEE 2005]

Answer: (A)

Solution

Moles of Al = 5120/27 = 189.6; charge = 189.6 × 3 × 96500 = 5.49 × C; (b) uses only one electron

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Question ID VK-066757