For 1 molal aqueous solution of the following compounds, wh…

Chemistry Solution & Colligative Properties JEE Advanced Previous Years Question Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 12, 2026

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

[Co(H 2 O) 4 Cl 2 ]Cl.2H 2 O

[Co(H 2 O) 3 Cl 3 ].3H 2 O

[Co(H 2 O) 6 ]Cl 3

[Co(H 2 O) 5 Cl]Cl 2 .H 2 O

Text Solution

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The correct answer is:

The complex having minimum value of vant Hoff's factor (i) will give minimum concentration and highest freezing point.

[Co(H 2 O) 4 Cl 2 ]Cl. 2H 2 O ⎯→ [Co(H 2 O) 4 Cl 2 ] + +Cl – (i = 2)

[Co(H 2 O) 3 Cl 3 ]3H 2 O ⎯→ No dissociation (i = 1)

[Co(H 2 O) 6 ]Cl 3 ⎯→ [Co(H 2 O) 6 ] +3 +3Cl – (i = 4)

[Co(H 2 O) 5 Cl]Cl 2 .H 2 O ⎯→ [Co(H 2 O) 5 Cl] +2 +2Cl – (i = 3)

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