Solutions of Gateway Examinations to IISER, NISER, JEE, NEET, NDA, ICAR, OUAT
Solutions of Gateway Examinations to IISER, NISER, JEE, NEET, NDA, ICAR, OUAT Topic: Solution (NDA, ICAR, OUAT Level) 1. Solubility of a gas in a solvent varies directly with the prssure of the gas, inversly with the temperature of the solution and directly with the liquefiability of a gas. So all of the above are true. 2. Calculate the amount of urea dissolved per litre if its aqueous solution is isotonic with 10% cane sugar solution. Isotonic Solutions are those having equal osmotic pressure (O.P). O.P = w R T / m V In case of Urea, w1 = ?, m1 = 60, V1 = 1 litre In case of Cane sugar, w2 = 10g, m2 = 342, V2 = 100ml = 0.1 litre Thus w1 R T / m1 V1 = w2 R T / m2 V2 Or w1 / m1 V1 = w2 / m2 .V2 Thus w1 = 17.543 g = 17.6 g 3. If we prepare separate solutions of 2 mole urea and 2 moles NaCl in one litre water, then whose boiling point will be higher? Number of particles in NaCl solution will be greater due to ionisation hence the value of any colligati...