JEE Main 2025 Chemistry question

1.24 g of (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 (molar mass 250 g mol⁻¹) in 2 kg of water constitutes a solution with a boiling point of 100.0260°C. K kg mol⁻¹ Which of the following is correct ?

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