Chemistry MCQs OF Chapter 9

Chemistry MCQs chapter 9 :

1- which one of the following solution will have the highest b.p
a. 5.85% solution of sodium chloride
b- 18% solution of glucose
c- 6% solution of urea
d- all have the same boiling point

2- sea water contains 5*10-3 g of dissolved oxygen in one kilogram of water. the concentration of oxygen in ppm is
a. 0.05
b. 0.5

c. 5.0
d. 50

3. cheese is an example of solution of
a. liquid into solid
b. solid into liquid
c. liquid into liquid
d. solid into solid

4. compound having max solubility at 25 C
a. NaCl
b. KNO3
C.CaCl2
d. HCl

5. which one of the following salts donot undergo hydrolysis
a. copper sulphate
b. sodium carbonate
c. sodium sulphate
d. aluminum chloride

6. when one mole of solute is dissolved in one kg solvent, depression 9n freezing point is called
a. cryoscopic constant
b. molao freezing point solution
c. both
d, none

7. a deci-molal solution of glucose contains
a. 18g kg -1
b. 1.8g per 100g
c- 180g per 10kg
d- all

8. when 2 g of sodium carbonate is dissolved in 20 g of water, percentage by weight of solution is
a.10
b. 9
c.  8
d. 5

9. the pair of liquids which is practically immiscible.
a. benzene and carbon tetrachloride
b. benzene and water
c. ethanol and water
d. none

10. a solution of glucose is 10%. one gram mole of it will be dissolved in
a.1dm3
b. 1.8 dm3
c. 2 dm3
d. 4 dm3

11. when chlorobenzene is mixed with bromobenzene to form a solution then heat is
a. absorbed
b.evolved
c. niether absorbed nor evolved
d. either absorbed or evolved

12. in ice cream machine  freezing mixture consist of ice and
a. NaCl
b. NaNO3
C. KCl
d. KNO3

14.  A solution of water and ethanol has vapour pressure
a. equal to water
b. eual to ethanol
c. less than water
d. more than water

15. a solution of sucrose is 34.2%. the volume of solution containing one mole of solute is
a. 600cm3
b. 1000cm3
c. 300cm3
d. 3000cm3

16. 10g of NaOH has been dissolved per dm3 of solution . the molarity of solution is
a. 1.5M
b. 0.25M
c. 2M
d. 3M

17. calcium chloride in the hydrated form can exist in ------------ different types
a. 2
b.3
c. 4
d. 5

18. the compound has max solubility at o0c
a. CaCl2
b. KNO3
C. HCl
D. NaNO3

19. concentration unit which is not affected by temperature is
a. molarity
b. normality
c. molality
d. all

20. which will cook food more easily
a. saline water
b. pure water
c. alcoholic water
d. acidic water

21. molal boiling point constant for water is 0.52%. if 6g of urea is dissolved in 100g of water , what will be its boiling point
a. 99.48
b.100.52
c. 99
d. 100

22. in a solution 7.8g of benzene and 46 g of toulene (C6H5CH3) are present. the mole fraction of benzene is
a. 1/2
b. 1/3
c. 1/5
d. 1/6

23. in the hydrates water molecules are attracted to
a.cations
b.anions
.c. both
d. none

24. which of the following has the max boiling point at 1atm pressure
a. 0.1M NaCl
b. 0.1M sucrose
c. 0.1M BaCl2
d. 0.1M glucose

25. camphor is often used in molecular mass dtermination because
a. it can dissolve oraganic substances
b. it is readily available
c. it has very high cryoscopic constant
d. it is volatile