11th class (FSc) chemistry Unit 2 MCQs
Chapter 2 MCQs 11th Class Chemistry
Experimental Techniques in chemistry:
1. The word porosite means:
a. Quality of pores
b. Size of pores
c. Nature of pores
d. Number of pores
2. Insoluble particles can be separated from liquid by:
a. Crystallization
b. Sublimation
c. Filtration
d. Solvent extraction
3. Rate of filtration can be increased by using:
a. Chromatographic tank
b. Desiccator
c. Suction flask
d. Cold fingure
4. Gooch crucible is made of:
a. Teflon
b. Glass
c. Porcelain
d. Paper
5. Which is not a property of an ideal solvent?
a. It should be easily removable
b. It should be safe to use
c. It should be expensive
d. It should not react chemically with the solute
6. One of these substances is not used as drying agent in the decolorizing agent?
a. Silica gel
b. P2O5
c. 50% KOH
d. Cone.H2SO2
7. Which one of the following substances is used as decolorizing agent?
a. CaCl2
b. Animal charcoal
c. Silica gel
d. Cone.H2SO4
8. When hot natural solution is cooled very rapidly we get:
a. Large size crystals
b. Medium size crystal
c. No crystallization
d. Premature crystallization of the substance
9. Which one of the following substances is not a drying agent?
a. Silica gel
b. NaCl
c. Phosphorous pentaoxide
d. CaCl2
10. During the process of crystallization the hot saturated solution is:
a. Evaporated to get the crystals of the product
b. Cooled at moderate rate to get medium sized crystals
c. Mixed with an immiscible liquid to get the pure crystal
d. Cooled very slowly to get large sized crystals
11. Drying agent used in in crystallization is:
a. KMnO4
b. P2O5
c. Water
d. Animal charcoal
12. The drying agent used in desiccator is:
a. NaCl
b. NH4Cl
c. CaCl2
d. NH4CL
13. Which of the following compounds do not show process of sublimation:
a. Naphthalence
b. Ammonium Chloride
c. Carbon tertrachloride
d. Iodine
14. Direct converion of solid into vapours is called:
a. Distribution
b. Crystallization
c. Vaporization
d. Sublimation
15. Which of the following substance shows the property of sublimation?
a. Ammonium chloride
b. Sodium chloride
c. Acetic acid
d. Copper Chloride
16. Which one is not example of a sublimand:
a. Sodium chloride
b. Ammonium chloride
c. Benzoic acid
d. Iodine
17. Compound purified by sublimation is:
a. Benzoic acid
b. SiO2
c. Nal
d. CS2