Question

which of the following shows low vapour pressure at 30 degree celsius?
i) 1 mole of aqueous urea
ii) 1 mole of aqueous glucose
iii) 1 mole of aqueous sucrose
iv) all have same vapour pressure ​

Answer 1

Explanation:

The molarity for all the options is same i.e. 0.1 M, thus the deciding factor would be 'i'

in A, i = 3

in B, i = 0

in C, i = 3

in D, i = 4

This implies that dissociation into ions is maximum in the case of D, and thus least vapour pressure is observed.