Which of the following solutions are isotonic with one another?
1. `0.15 M` urea 2. `0.05M CaCI_(2)`
3. `0.1M MgSO_(4)` 4. `0.15M` glucose
Select the correct answer using the codes given below.

Options

A. 1 and 4
B. 2 and 3
C. 1,2 and 4
D. 2,3 and 4

Answer

C

Explanation

`" "pi = icRT`
(1) `pi (0.15 M "urea") " " = 1 xx 0.15 RT = 0.15 RT`
(2) `pi (0.05 M CaCl_(2)) " " 3 xx 0.05 RT = 0.15 RT`
(3) `pi (0.1 M MgSO_(4)) " " = 2 xx 0.1 RT = 0.2 RT`
(4) `pi (0.15 M "glucose") " "=1xx0.15 RT = 0.15 RT`
`therefore ` (1),(2) and (4) are isotonic.