The ebullioscopic constant is______

The correct answer is Option (1) → Boiling Point Elevation Constant

The elevation of the boiling point of a dilute solution is proportional to its molality:

    \( \displaystyle \Delta T_b=K_b\,m \)

K_b is the elevation of boiling point for a 1 molal solution; for water it is 0.52 K kg mol⁻¹.

The related constants are:

• K_f (cryoscopic constant): freezing point depression constant, ΔT_f = K_f m.

• i (van’t Hoff factor): corrects colligative properties for dissociation or association of the solute.

• K_H (Henry’s constant): relates the pressure of a gas to its solubility, p = K_H x.

NCERT (2026-27 edition):
Elevation of Boiling Point – …