For which of the following is the van't hoff factor 2, assuming complete dissociation?

a)
calcium phosphate

b)
aluminum chloride

c)
calcium chloride

d)
sodium chloride

d) Sodium Chloride

Explanation:

The correct answer is option (d) sodium chloride. Generally, the van't Hoff factor is determined from the complete dissociation of the substance. It is calculated as the total number of ions present in the solution per unit of the substance formula. Therefore, for calcium phosphate, the factor is 5, for aluminum chloride, it is 4, for calcium chloride, it is 3 while for sodium chloride, it is 2.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance

c. 4.54 x 10–12 j happens to be correct