In Ideal soiutions

9. Which of the following statements is false? [NCERT Exemplar]

(а) Two different solutions of sucrose of same molality prepared in different solvents will have the same depression in freezing point.

(b) The osmotic pressure of a solution is given by the equation π = CRT (where C is the molarity of the solution).

(c) Decreasing order of osmotic pressure for 0.01 M aqueous solutions of barium chloride, potassium chloride, acetic acid and sucrose is

BaCl2 > KCl > CH3COOH > sucrose.

(d) According to Raoult’s law, the vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution.

In comparison to a 0.01 M solution of glucose, the depression in freezing point of a 0.01 M MgCl2 solution is _________ . [NCERT Exemplar]

(a) the same

(b) about twice

(c) about three times

(d) about six times

. We have three aqueous solutions of NaCl labelled as ‘A’, ‘B’ and ‘C’ with concentrations 0.1M, 0.01M and 0.001M, respectively. The value of van’t Hoff factor for these solutions will be in the order __________ . [NCERT Exemplar

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law? [NCERT Exemplar]

(a) Methanol and acetone.

(b) Chloroform and acetone.

(c) Nitric acid and water.

(d) Phenol and aniline.

Low concentration of oxygen in the blood and tissues of people living at high altitude is due to _________ .[NCERT Exemplar]

(a) low temperature

(b) low atmospheric pressure

(c) high atmospheric pressure

(d) both low temperature and high atmospheric

Which of the following aqueous solutions should have the highest boiling point? [NCERT Exemplar]

(a) 1.0 M NaOH

(b) 1.0 M Na2SO4

(c) 1.0 M NH4NO3

(d) 1.0 M KNO3

. Which has the highest freezing point?

(a) 1 M glucose

(b) 1 M NaCl

(c) 1 M CaCl2

(d) 1 M AlF3

In the following question a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.

(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.

(c) Assertion is correct statement but reason is wrong statement.

(d) Assertion and reason both are incorrect statements.

(e) Assertion is wrong statement but reason is correct statement.

Assertion: When methyl alcohol is added to water, boiling point of water increases. Reason: When a volatile solute is added to a volatile solvent elevation in boiling point is observed. [NCERT Exa

. Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is

(a) 0.46

(b) 0.40

(c) 0.20

(d) 0.36

The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows

(a) no deviation from Raoult’s Law.

(b) positive deviation from Raoult’s Law.

(c) negative deviation from Raoult’s Law.

(d) that the solution is unsaturated.

Which has the lowest boiling point at 1 atm pressure?

(a) 0.1 M KCl

(b) 0.1 M Urea

(c) 0.1 M CaCl2

(d) 0.1 M A1Cl3