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QJEEM05Chcdd4: JEE Main 2005 Chemistry - Class 12 JEEM05Chcdd4 Solution: Aluminium oxide may be electrolysed at 1000 o C to furnish…

Aluminium oxide may be electrolysed at 1000oC to furnish aluminium metal (Atomic mass = 27 amu; 1 Faraday = 96,500 Coulombs). The cathode reaction is Al3+ + 3e- →\to Alo To prepare 5.12 kg of aluminium metal by this method would require

Multiple Choice Options

  • A 5.49 ×\times 107 C of electricity
  • B 1.83 ×\times 107 C of electricity
  • C 5.49 ×\times 104 C of electricity
  • D 5.49 ×\times 101 C of electricity

Step-by-Step Verified Solution

11 mole of e−=1F=96500 C{e^ - } = 1F = 96500\,C

27g27g of AlAl is deposited by 3×96500 C3 \times 96500\,C

51205120 gg of AlAl will be deposited by

=3×96500×512027= {{3 \times 96500 \times 5120} \over {27}}

=5.49×107C= 5.49 \times {10^7}C

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