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Chemistry - 9 Chapter - 7
Solution and Suspension
Test - 6
1.
What is crystallization?
a) To form crystals or make something form crystals
b) To form crystals or make something for crystals
2.
Why crystallization is a useful process?
a) Pure solid compounds can be purified and mixtures of solids can be separated.
b) Impure solid compounds can be purified and mixtures of solids can be separated.
3.
All saturated solutions of compounds crystallize its solute, if cooled slowly without disturbance.
a) True
b) False
4.
How super saturated solution can be made to crystallize?
a) By disturbing it or adding a small crystal of the solute.
b) By disturbing it or adding a large crystal of the solute.
5.
What are the factors effecting the solubility?
a) Nature of solvent
b) Temperature
c) All are correct
d) Nature of solute
6.
When the chemical structure and the electrical properties of solute and solvent are similar the solubility will:
a) Increase
b) No effect
c) Decrease
7.
If there is dissimilarity in properties of solute and solvent, the solute will not dissolve or there will be less solubility.
a) False
b) True
8.
Water being a polar compound is a good solvent for polar substances such as:
a) kerosene oils , grease
b) two answers are correct
c) naphthalene
d) alcohol and common salts
9.
Water being a polar compound cannot dissolve non polar substances like________.
a) All are correct
b) Kerosene oil
c) Nephtalene
d) Grease
10.
Different solutes have different solubility in a particular solvent.
a) False
b) True
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