Solution A contains 7 g/L of `MgCl_(2)` and solution B contains 7 g/L of NaCl. At room temperature, the osmotic pressure of :

Options

A. Solution A is greater than B
B. Both have same osmotic pressure
C. Solution B is greater than A
D. Can't determine

Answer

C

Explanation

Concentration of NaCl solution `=(7)/(58.5)=0.119 M`
Concentration of `MgCl_(2)` solution `=(7)/(95)=0.074 M`
Hence, particles (ions) in NaCl solution
`(B) = 2xx0.119 = 0.238 M`
Hence, particles (ions) in `MgCl_(2)` solution
`(A)=3xx0.074 = 0.222 M`
As the particles in solution B (NaCl) is more than in solution A, the osmotic pressure of solution B will be greater than that of solution A.