Q35 / 125 · BITSAT 2016 · Chemistry

The EMF of the cell $\mathrm{Tl} / \mathrm{Tl}^{+}(0.001 \mathrm{M}) \| \mathrm{Cu}^{2+}$ $(0.01 \mathrm{M}) / \mathrm{Cu}$ is $0.83 .$ The cell EMF can be increased by

  • A
    Increasing the concentration of $\mathrm{Tl}^{+}$ ions.
  • Correct answer
    B
    Increasing the concentration of $\mathrm{Cu}^{2+}$ ions.
  • C
    Increasing the concentration of $\mathrm{Tl}^{+}$ and $\mathrm{Cu}^{2+}$ ions.
  • D
    None of these

Solution

The oxidation potential $\propto \frac{1}{\text { Concentration of ions }}$ and reduction potential $\propto$ concentration of ions. The cell voltage can be increased by decreasing the concentration of ions around anode or by increasing the concentration of ions around cathode

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

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