1.24 g of ${\rm{A}}{{\rm{X}}_2}$ (molar mass $124\;{\rm{g}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$) is dissolved in 1 kg of water to form a solution with boiling point of ${100.0156^\circ }{\rm{C}}$, whill $25.4\;{{\rm{g}}^2}$ of ${\rm{A}}{{\rm{Y}}_2}$ (molar mass $250\;{\rm{g}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$) in 2 kg of water constitutes a solution with a boiling point of ${100.0260^\circ }{\rm{C}}$.
${{\rm{K}}_{\rm{b}}}\left( {{{\rm{H}}_2}{\rm{O}}} \right) = 0.52\;{\rm{K}}\;{\rm{kg}}\;{\rm{mo}}{{\rm{l}}^{ - 1}}$
Which of the following is correct?
Select the correct option:
A
${\rm{A}}{{\rm{X}}_2}$ and ${\rm{A}}{{\rm{Y}}_2}$ (both) are completely unionised
B
${\rm{A}}{{\rm{X}}_2}$ and ${\rm{A}}{{\rm{Y}}_2}$ (both) are fully ionised.
C
${\rm{A}}{{\rm{X}}_2}$ is completely unionised while ${\rm{A}}{{\rm{Y}}_2}$ is fully ionised.
D
${\rm{A}}{{\rm{X}}_2}$ is fully ionised while ${\rm{A}}{{\rm{Y}}_2}$ is completely unionised.
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