Chemistry 11 Chapter 2
Experimental Tehniques In Chemistery
Test 12
1.
The example of solid which directly converted into gas is
a) Ammonium chloride
b) All of these
c) Naphthalien
d) Iodine
2.
Slow cooling yields ______ crystals
a) Moderate
b) None of these
c) Smaller
d) Larger
3.
If the solvent is inflammable then precution should be taken while
a) Heating
b) Releasing
c) Absorbing
d) Cooling
4.
The drying agents used in a desiccators is
a) CaCl2
b) Phosphorous pentaoxide
c) Silica gel
5.
For the obtaining of medium sized crystals the filteration should be at
a) Faster rate
b) None of these
c) Modrate rate
d) Slower rate
6.
A safe and reliable method of drying crystals is through
a) None of these
b) Vacuum desiccators
c) Microwave oven
d) Vacuum absorber
7.
In dryind process crystals are dried in oven at______ C
a) 1000
b) 1100
c) 1200
d) 1500
8.
In the case of catches fire ________ is used
a) Gooch crucible
b) Sand bath
c) Filter paper
d) Water bath
9.
Which solvents is not used for crystallization
a) Aceton
b) Phenophhalien
c) Water
d) Rectified spirit
10.
The colouring impurities are removed by
a) Animal charcoal
b) Vacuum absorber
c) Microwave oven
d) Vacuum desiccators
This is more feedback!
This is the feedback!
