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Help me understand! Which of the following aqueous molal solution have highest freezing point

Which of the following aqueous molal solution have highest freezing point

  • Option 1)

    Urea

  • Option 2)

    Barium chloride

  • Option 3)

    Potassium bromide

  • Option 4)

    Aluminium sulphate

 
Answers (1)
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As we learned 

 

Depression in freezing point -

-

 

 KBr=K^{+}+Br^{-}=2\: ions

BaCl_{2}=Ba^{2+}+2Cl^{-}=3\: ions

Al_{2}(SO_{4})_{3}=2Al^{3+}+3SOl_{4}^{2-}=5\: ions

\therefore urea is not ionise hence it is shows highest freezing point.

 


Option 1)

Urea

Option 2)

Barium chloride

Option 3)

Potassium bromide

Option 4)

Aluminium sulphate

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