1. Tardigrade
  2. Question
  3. Chemistry
  4. Which has the minimum freezing point ?

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Which has the minimum freezing point ?

UPSEEUPSEE 2005

Solution:

Depression in freezing points is colligative property. The solute which produces highest number of ions will have minimum freezing point.

(a) One molal $NaCl$ aqueous solution

$\to \, Na ^{+}+ Cl ^{-}$

$\therefore $ 2 ions / molecule

(c) one molal KCl aqueous solution

$\to K ^{+}+ Cl ^{-}$

$\therefore $ 2 ions/ molecule

(d) One molal urea aqueous solution$\to$ no dissociation

(b) One molal $CaCl _{2}$ solution

$CaCl _{2} \to Ca ^{2+}+2 Cl ^{-}$

$\therefore \,3$ ions/molecule

$\because \, CaCl _{2}$ solution has highest number of ions

$\therefore $ it has lowest freezing point.