11th class (FSc) chemistry Unit 9 MCQs
Chapter 9 MCQs 11th Class Chemistry
Solutions:
1. A solution of glucose is 10% w/v. The volume in which 1 gram mole of it is dissolved will be:
a. 200 cm3
b. 1 dm3
c. 900 cm3
d. 1.8 dm3
2. Molarity of pure water is:
a. 55.5
b. 1.0
c. 6.0
d. 18.0
4. The amount of NaOH required to prepare 250 cm3 of 1M solution:
a. 20
b. 10
c. 25
d. 15
5. 10g NaOH dissolved per 250cm3 of solution has molarity:
a. 1.5M
b. 5M
c. 2.0M
d. 1.0M
6. The number of moles of solute per kilogram of solvent is called:
a. Mole-fraction
b. Molarity
c. Normality
d. Molality
7. 0.1 mole of a solute dissolved in 100 g of solvent will be:
a. 0.5 molal
b. 0.1 molal
c. 0.2 molal
d. 1.0 molal
8. Which of the following concentration unit it temperature dependent?
a. Mole fraction
b. Molality
c. Percentage w/w
d. Molarity
9. If 5.85 g of NaCl (mol mass 58.5) is dissolved 90 g of H2O. the mole fraction of NaCl will be:
a. 0.0196
b. 0.01
c. 0.3
d. 0.0
10. The critical solution temperature of phenol-water system is:
a. 57.8oC
b. 33.6oC
c. 65.9oC
d. 49.5oC
11. Benzene- ether can form:
a. Buffer-solution
b. Ideal solution
c. Non-Ideal
d. None of these
12. Ideal solution obey:
a. Raoult’ law
b. Henry’s law
c. Smith’s law
d. Avogadro’s law
13. The azeotropic mixture of solution showing positive deviation can bedistilled at boiling point:
a. No sharp
b. Maximum
c. Minimum
d. None of these
14. An azerotropic mixture of two liquids boils at a lower temperature than either of than when:
a. It is meta stable
b. It is saturated
c. It shows negative deviation from Raoult’s law
d. It shows positive deviation from Raoults’s law
15. Which one of the following is an ideal solution:
a. CHCl and(CH3)CO
b. C2H5OH andH2O
c. H2O and HCl.
d. C6H6and CCl4
16. An aqueous solution of ethanol in water has vapour pressure:
a. More than that of water
b. Equal to that of water
c. Less than that of water
d. Equal to that of ethanel
17. The concentration of solute in the solution when it is in equilibrium with the solid substance at a particular temperature is called:
a. Molality
b. Solubility
c. Mole fraction
d. Molarity
18. On cooling a hot saturated solution makes the solution:
a. Opaque
b. Dilute
c. Unsaturated
d. Super saturated
19. which of the following solution has the highest boiling point?
a. 6.0 % solution of urea
b. 5.85 % solution of sodium chloride
c. All have the same boiling point
d. 18.0% solution of glucose
20. The molal boiling point constant depends upon:
a. Heat of vaporization of solvent in the solution
b. Nature of solvent
c. Lowing of vapour pressure of a solution
d. Vapour pressure of solution
21. Which is the colligative property?
a. Heat of vaporization of solvent in the solution
b. Change in vapour pressure of a solution
c. Lowering of vapour pressure of a solution
d. Change in free energy of a solution
22. Colligative properties are the properties of:
a. Dilute solutions behave as nearly ideal solution
b. Both a and c
c. Dilute solution which be have as nearly no ideal solutions
d. Neither a and nor c
23. Molal boiling point constant is the ratio of the elevation in boiling point to:
a. Mole fraction of solute
b. Molarity
c. Molality
d. Mole fraction of solvent
24. 18 g of glucose is dissolved in 90g of water. The relative lowering of vapour pressure is equal to:
a. 1/51
b. 1/5
c. 6
d. 5.1
25. Chemical used to protect a car by preventing the liquid in the radiator from freezing is:
a. KNO3
b. Phenol
c. Methanol
d. Ethylene glycol