UNIT: SOLUTIONS
WORKSHEET -1
1. Value of Henry’s constant KH .
a. increases with increase in temperature.
b. decreases with increase in temperature.
c. remains constant.
d. first increases then decreases.
2. Which of the following aqueous solutions would have the highest boiling point ?
a. 1.0 M NaOH
b. 1.0 M Na2SO4
c. 1.0 M NH4NO3
d. 1.0 M KNO3
3. Which of the following units is useful in relating concentration of solution with its vapour
pressure?
a. mole fraction
b. parts per million
c. mass percentage
d. molality
4. Colligative properties depend on .
a. the nature of the solute particles dissolved in solution.
b. the number of solute particles in solution.
c. the physical properties of the solute particles dissolved in solution.
d. the nature of solvent particles.
5. The unit of ebulioscopic constant is .
a. K kg mol–1
b. mol kg K–1
c. kg mol–1
d. K mol kg1
6. Solubility of gases in liquids
a. decreases with increasing temprature
b. increases with increasing temprature
c. does not change with temprature.
d. can’t say
7. The value of Henry’s constant KH is:
a. greater for gases with higher solubility
b. greater for gases with lower solubility
c. constant for all gases
d. not related to the solubility of gases
8. Which of following is not a Colligative property?
a. Relative lowering of vapour pressure
b. Elevation in boiling point
c. Osmotic pressure
d. Atmospheric pressure
9. If solute do not undergo either association or dissociation, its Van’t Hoff factor will be:
a. less than unity
b. greater than unity
c. unity
d. zero
10. Maximum amount of a solid solute that can be dissolved in a specified amount of a
given liquid solvent does not depend upon :
a. Temperature
b. Nature of solute
c. Pressure
d. Nature of solvent
11. Low concentration of oxygen in the blood and tissues of people living at high
altitude is due to .
a. low temperature
b. low atmospheric pressure
c. high atmospheric pressure
d. both low temperature and high atmospheric pressure
12. An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because
a. it gains water due to osmosis.
b. it loses water due to reverse osmosis.
c. it gains water due to reverse osmosis.
d. it loses water due to osmosis.
13. At a given temperature, osmotic pressure of a concentrated solution of a substance
a. is higher than that at a dilute solution.
b. is lower than that of a dilute solution.
c. is same as that of a dilute solution.
d. cannot be compared with osmotic pressure of dilute solution.
14. Which of the following statements is false?
a. 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.
.
15. We have three aqueous solutions of NaCl labeled 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______.
a. iA < iB < iC
b. iA > iB > iC
c. iA = iB = iC
d. iA < iB > iC
