1.24 g of (AX _ 2 ) (molar mass (124 g mol^ -1 ) ) is dissolved in...

1.24 g of (\mathrm{AX}}_{2}) (molar mass (124 \mathrm{ g} \mathrm{ mol}^{-1}) ) is dissolved in 1 kg of water to form a solution with boiling point of (100.0156^{{}^{\circ}} $\mathrm{C}$), while (25.4 \mathrm{ g}^{{}^{\circ}}) of (\mathrm{AY}}_{2}) (molar mass (250\mathrm{ g} \mathrm{ mol}^{-1}$) ) in 2 kg of water constitutes a solution with a boiling point of (100.0260^{{}^{\circ}}$\mathrm{C}). (\mathrm{K}_{\mathrm{b}}\left(\mathrm{H}}_{2} \mathrm{O}\right)=0.52 $\mathrm{ K} \mathrm{ kg} \mathrm{ mol}^{-1}$) Which of the following is correct ?