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1.24 g of AX 2 (molar mass 124 g mol –1 ) is dissolved in 1 kg of water to form a solution with boiling point of 100.0156°C, while 25.4 g of AY 2 (molar mass 250 g mol –1 ) in 2 kg of water constitutes a solution with a boiling point of 100.0260°C. K b (H 2 O) = 0.52 K kg mol –1 Which of the following is correct ?

1. AX 2 and AY 2 (both) are completely unionised.
2. AX 2 and AY 2 (both) are fully ionised.
3. AX 2 is completely unionised while AY 2 is fully ionised.
4. AX 2 is fully ionised while AY 2 is completely unionised.

Correct answer: AX 2 is fully ionised while AY 2 is completely unionised.

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