The term absolute zero refers to which combination of the following?

Question

I. The temperature at which water freezes

II. The temperature at which a gas has zero volume

III. The temperature at which a gas has zero pressure

IV. -273.15 Celsius

 

a) I only

b) II only

c) II and IV

d) II, III, and IV

e) I, III, and IV

 

I know IV is right but I'm not sure what the right answer is 

Answer 1

I. The temperature at which water freezes  This is not true!  water freezes at 273K

 

II. The temperature at which a gas has zero volume  This is true - particles will have no motion.

 

III. The temperature at which a gas has zero pressure  Also true for the same reason - no motion means no collisions.

 

IV. -273.15 Celsius  Yes, its true.  0 K = -273 C  273 K = 0 C  373 K = 100 C (water boils)