Colligative Properties (conductivity?)

[Stephen2009]

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So I just finished taking a practice exam and there was a Q:
Which of the following are examples of colligative properties?

I. Vapor pressure
II. Electrical conductivity
III. Osmotic pressure


Now I picked all of the above, but the answer was I and III only.

Now TBR Chem has conductivity (condosity) listed under colligative properties... So who is right, the practice exam or TBR, or am I misinterpreting?

 

[Aiu]

Conductivity is not a colligative property as far as I know..

 

[golgiapparatus88]

Even though some of the colligative properties depend on the ion number, conductivity itself does not depend on the concentration.

 

[chemtopper]

Even though some of the colligative properties depend on the ion number, conductivity itself does not depend on the concentration.

I think we should concentrate on the meaning of the colligative properties.
They depend only on amount and not on the nature of the substance .But as we know that conductance depends on the nature of the substance also as some compounds are good conductors and some are bad conductors .Conductivity is also defined as the measure of material's ability to conduct.I feel that this particular line which is relating conductivity with material's ability is enough to kick out conductivity from the group of colligative properties.

 

[Rabolisk]

What is chemtopper?

 

[chemtopper]

What is chemtopper?

It is my webname .

http://chemtopper.com/Organic_Chemistry.php