Colligative properties i.e., the properties of solution which depend upon the particles present in solution are osmotic pressure, depression in freezing point, elevation in boiling point and relative lowering of vapour pressure. Experimental values of colligative properties for electrolytes are always higher than those obtained theoreticallu. The ratio of experimental colligative properties to theoretical colligative properties is called as van't Hoff factor (i).
A weak monoprotic acid (molar mass `= 180`) aqeous solution of `0.18%` w/v at `300 K` has observed osmoles pressure `0.369` atm. What should be its van't Hoof factor(i) `(R = 0.082 atm xx L//K//"mole")` ?

Options

A. `1.2 `
B. `1.5 `
C. `1`
D. `0.5`

Answer

B