Addition of non-volatile solute to a solvent always increases the colligative properties such as osmotic pressure. Delta P . Delta T_b and Delta T_f . All these colligative properties are directly proportional to molality if solutions are dilute. The increases in colligative properties on addition of non-volatile solute is due to increases in number of solute particles. For different aqueous solutions of 0.1 N NaCI, 0.1 N urea, 0.1 N Na_2SO_4 and 0.1 N Na_3PO_4 solution at 27^@C , the correct statements are : 1. The order of osmotic pressure is NaCI = Na_2SO_4 = Na_3PO_4 = urea 2. pi = (Delta T_b)/k_b xx RT for urea solution 3. Addition of salt on ice increases its melting point 4. Addition of salt on ice bring in melting of ice earlier

Addition of non-volatile solute to a solvent always increases the colligative properties such as osmotic pressure. Delta P . Delta T_b and Delta T_f . All these colligative properties are directly proportional to molality if solutions are dilute. The increases in colligative properties on addition of non-volatile solute is due to increases in number of solute particles. 1 g mixture of glucose and urea present in 250mL aqueous solution shows the osmotic pressure of 0.74 atm at 27^@C . Assuming solution to be dilute which are correct ? 1. Percentage of urea in mixture is 17.6. 2. Relative lowering in vapour pressure of this solution is 5.41 xx 10^(-4) . 3. The solution will boil at 100.015^@C . if k_b of water is 0.5 k molality^(-1) . 4. If glucose is replaced by same amount of sucrose the solution will show higher osmotic pressure at 27^@C . 5. If glucose is replaced by same amount of NaCI, the solution will show lower osmotic pressure at 27^@C .

The colligative property is not represented by