What amount of electricity is required to deposit one mole of aluminium from a solution…

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Chemistry WAEC 2022

What amount of electricity is required to deposit one mole of aluminium from a solution of AlCl3?

  • One Faraday
  • One ampere
  • Three Faradays checkmark
  • Three amperes

The correct answer is: C

Explanation

AlCl3 → Al3+ + 3Cl-
At cathode:
Al3+ + 3e- → Al
3 mole of electrons corresponds 3 F charge
So, required charge =3 F

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