Q10 / 150 · MHT CET 2022 (07 Aug Shift 1) · Chemistry

How many moles of electrons are required for the reduction of 3 mole ions if $\mathrm{Zn}^{2+}$ to $\mathrm{Zn}(\mathrm{s})$ ?

  • A
    9
  • Correct answer
    B
    6
  • C
    2
  • D
    3

Solution

$\begin{aligned} & \underset{1 \mathrm{~mole}}{\mathrm{Zn}^{+2}+2 \mathrm{e}^{-} \rightarrow \mathrm{mol}} \rightarrow \mathrm{Zn}(\mathrm{s}) \\ & \therefore 3 \mathrm{~mol} 6 \mathrm{~mol}\end{aligned}$

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

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