Q77 / 180 · NEET 2013 (Karnataka) · Chemistry

How many gram of cobalt metal will be deposited when a solution of cobalt (II) chloride is electrolyzed with a current of 10 amperes for 109 minutes (1 Faraday = $96,500 \mathrm{C}$; Atomic mass of $\mathrm{Co}=59 u$ )

  • A
    4.0
  • Correct answer
    B
    20.0
  • C
    40.0
  • D
    0.66

Solution

$$ \begin{aligned} W & =\frac{\mathrm{I} t \mathrm{E}}{96500} \\ & =\frac{10 \times 109 \times 60 \times 59}{96500 \times 2} \\ & =19.99 \approx 20 \mathrm{~g} \end{aligned} $$

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

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