The limiting molar conductivities of $X^{+}$ and $Y^{-2}$ ions are $45$ and $110 \ S \ cm^2 \ mol^{-1}$ respectively. The $\Lambda_{m}^{\infty}$ of $X_2Y$ is:
- A$200 \ S \ cm^2 \ mol^{-1}$
- B$100 \ S \ cm^2 \ mol^{-1}$
- C$400 \ S \ cm^2 \ mol^{-1}$
- D$77.5 \ S \ cm^2 \ mol^{-1}$
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