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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