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.)

$$ \begin{aligned} & X^{2+}+2 e^{-} \rightarrow X, E^0=0.35 \\ & Y^{2+}+2 e^{-} \rightarrow Y, E^0=0.40 \mathrm{~V} \end{aligned} $$

( $E^0$ is the standard reduction potential.)