Figure explains elevation in boiling point when a non-volat…

Chemistry Solution & Colligative Properties General Numeric Response

Published on: August 14, 2026

Figure explains elevation in boiling point when a non-volatile solute is added to a solvent.

(i) Given that Δ Tb is the elevation in boiling point of the solvent in a solution of molality ‘m’ then is equal to –

Kb (molal elevation constant) 0.982 K3[Fe(CN)6]

Ly (latent heat of vaporisation) 0.0567 Fe(CN)2

Δ S (entropy change) 0.943 K4[Fe(CN)6]

X (mole fraction of solute) (ii) Elevation in b.p. of an aqueous urea solution is 0.52º. (Kb = 0.52º mol–1 kg). Hence, mole fraction of urea in this solution is – 0.018 (iii) A complex of iron and cyanide ions is 100% ionised at 1 m (molal) If its elevation in b.p. is 2.08º. (kb = 0.52) then complex is – Fe(CN)4

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The correct answer is:

0.018

(i)

Sol. Kb (molal elevation constant)

(ii)

Sol. 0.018

(iii)

Sol. K3[Fe(CN)6]

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