An aqueous solution contains 1.0 M of $\mathrm{X}^{2+}$ and 0.001 M of $\mathrm{Y}^{2+}$ ions at $25^{\circ} \mathrm{C} . \mathrm{X}^{2+}$ and $\mathrm{Y}^{2+}$ ions do not interact with each other. This solution is put in an electrolytic cell and the voltage is gradually increased till a current begins to flow through the cell. The voltage is maintained at this point and a deposit is observed on the cathode. What is the composition of the material deposited on the cathode?
(Given: Atomic weight of X is 63 and Y is 200.
$\mathrm{X}^{2+}+2 e^{-} \rightarrow \mathrm{X}, E^0=0.35 \mathrm{~V}$,
$\mathrm{Y}^{2+}+2 e^{-} \rightarrow \mathrm{Y}, E^0=0.40 \mathrm{~V}$,
$E^0$ is the standard reduction potential.)

• A

  $98 \% \mathrm{X}$ and $2 \% \mathrm{Y}$ by weight
• Correct answer
  B

  Only X
• C

  $24 \% \mathrm{X}$ and $76 \% \mathrm{Y}$ by weight
• D

  Only Y

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