Q9 / 150 · MHT CET 2022 (08 Aug Shift 1) · Chemistry

What will be the weight of $\mathrm{Al}$ deposited at cathode, when 0.5 faraday of electricity is passed through aqueous solution of $\mathrm{AlCl}_3$ ? (at mass of $\mathrm{Al}=27$ )

  • Correct answer
    A
    4.5 g
  • B
    13.5 g
  • C
    40.5 g
  • D
    3.0 g

Solution

$\begin{array}{cc}\mathrm{Al}^{+3}+3 \mathrm{e}^{-} & \mathrm{Al}(\mathrm{s}) \\ 3 \mathrm{~F} & 27 \mathrm{~g} \\ 0.5 \mathrm{~F} & 4.5 \mathrm{~g}\end{array}$

Hence, the correct answer is option: 'A'.

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