Which of the following statements is true? (a) Osmosis can be reversed by applic
ID: 564911 • Letter: W
Question
Which of the following statements is true? (a) Osmosis can be reversed by application of pressure on the solution (b) Beckmann thermometer can be used to measure elevation in boiling point (c) Osmosis and diffusion are same in solutions (d) Barometer can be used to measure osmotic pressure 44. The van't HofT factor for dilute aqueous solutions of urea and NaCI respectively are (a) 1. greater than1 (c) 0,1 45. (d) greater than 1. 1 The observed molecular mass in case of electrolytes of the type AB, is (a) 46. equal to the normal molecular mass greater than the normal molecular mass (b) (d) less than the normal molecular mass none of these (c) The compounds which undergo association in solutions have observed molecular mass always (a) (c) 47· equal to their normal molecular mass greater than their normal molecular mass (b) (d) less than their normal molecular mass none of these The van't Hoff factors for urea, sucrose and glucose are in the ratio The value of van't Hoff factor is more than one in dissociation and less than one in association. This statement is (a) false (c) sometimes false, sometimes true 49 (b) true (d) none of theseExplanation / Answer
44. Statement (a) is not correct. Osmosis can be reversed only if suffiecient amount of pressure is applied from the solution of higher concentration side.
Statement (d) is not correct. Barometer is used to measure atmospheric pressure.
Statement (b) is correct. Beckmann thermometer is used to measure very small change in temperature.
Statement (c) is not correct. In Osmosis solvent molecules pass through the semipermeable membrane from less concentrated solution to more concentrated solution. In Diffusion molecules move from more concentrated to less contrates solution.
So correct option is (b).
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