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1. Solution and colligative properties — Chemistry STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceChemistry1. Solution and colligative properties1 Mark
MCQ
The elevation in boiling point for one molal solution of a solute in a solvent is called
  • A
    Boiling point constant
  • ✓
    Molal elevation constant
  • C
    Cryoscopic constant
  • D
    None of these
✓

Answer

Correct option: B.
Molal elevation constant
b
Elevation of boiling point on adding one mole solute to $1000\, g$ solvent(one molal) is called molal boiling point elevation constant. It is denoted by $K _{ b }$. Its unit is $K\,kg\,mol^{-1}$, e.g. for water $K_b =0.52\, K\,kg\, mol^{-1}$.

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