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1.24 g of \(A{X}_{2}\) (molar mass \(124gmo{l}^{-1}\)) is dissolved in 1 kg of water to form a solution with boiling poi…

Q1

1.24 g of \(A{X}_{2}\) (molar mass \(124gmo{l}^{-1}\)) is dissolved in 1 kg of water to form a solution with boiling point of \(100.0156^\circ C\), while 25.4 g of \(A{Y}_{2}\) (molar mass \(250gmo{l}^{-1}\)) in 2 kg of water constitutes a solution with a boiling point of \(100.0260^\circ C\).

\({K}_{b}\left({H}_{2}O\right)=0.52Kkgmo{l}^{-1}\)

Which of the following is correct ?

[JEE Main 2025, 29 Jan (Shift 1)]

a

\(A{X}_{2}\) and \(A{Y}_{2}\) (both) are completely unionised.

b

\(A{X}_{2}\) is fully ionised while \(A{Y}_{2}\) is completely unionised.

c

\(A{X}_{2}\) and \(A{Y}_{2}\) (both) are fully ionised.

d

\(A{X}_{2}\) is completely unionised while \(A{Y}_{2}\) is fully ionised.

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