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GO" IMENT PU COLLEGE, MOKA, , , , , , SUB: CHEMISTRY(34) DATE: 01/08/2021, CLASS: 2°” PUC TEST-2 MAX.MARKS: 20, 1. ANSWER ALL THE QUESTIONS. EACH QUESTION CARRIES 1 MARK. 5x 1=5., , 1, What are azeotropic mixtures?, , 2. Wha notic pressure?, , 3. What are isotonic solutions?, , 4, What happens to the blood cell when it is placed in hypertonic solution (higher cone. than, , 0.9% aqueous NaCl)?, 5. How temperature does affect the molarity?, , I ANSWER ANY THREE OF THE FOLLOWING. EACH QUESTION CARRIES 2 MARKS., 3x2=6, 6. What is reverse osmosis? Give its use., Explain the effect of temperature and pressure on solubility of a gas in liquid., 8. Write any two differences between non-ideal solutions showing positive and negative, deviation from Raoult’s law, 9. State Raoult’s law and write equation,, , , , Ill, ANSWER ANY THREE OF THE FOLLOWING. EACH QUESTION CARRIES 3 MARKS., , 3x3=9, , 10, Write the differences between ideal and non-ideal solution,, , 11, A) State Henry’s law and write equation., , B) 10mL of liquid A and 10mL of liquid B are mixed then volume of solution found to be, 19.9mL. What type of deviation could be expected from Raoult’s law?, , 12. The boiling point of benzene is 353.23 K. When 1.80 g of a non-volatile solute was, dissolved in 90 g of benzene, the boiling point is raised to 354.11 K. Calculate the molar, mass of the solute. Ky for benzene is 2.53 K kg mol“!, , 13. The vapour pressure of pure benzene at a certain temperature is 0.850 bar. A nonvolatile, non-electrolyte solid weighing 0.5 g when added to 39.0 g of benzene (molar, mass 78 g mol”), Vapour pressure of the solution, then, is 0.845 bar. What is the molar, mass of the solid substance?
