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Chemistry - 9 Chapter - 7
Solution and Suspension
Test - 2
1.
Why gases are insoluble?............................ Because gas molecules being far apart have least attraction for each other. They develop weak attractive forces for solvent as well. That's why gases are ------- soluble.
a) not
b) hidhly
2.
Define Solubility?................. The amount of a solute in grams, which has been dissolved in ----------- of a solvent at a particular temperature to prepare a saturated solution.
a) 100g
b) 1000g
3.
How the solubility of gases can be increased?
a) By applying pressure
b) By dissipating
c) By heating
d) By cooling
4.
Why solubility of gases increase due to pressure?
a) Far apart molecules of gases become closer and their attractive forces increase enhancing solubility.
b) Far apart molecules of gases become closer and their attractive forces decrease enhancing solubility.
5.
Solubility of gases increase due to pressure.
a) False
b) True
6.
How a gas can readily dissolve in a liquid solvent at atmospheric pressure?
a) due to atmospheric pressure
b) due to chemical action
c) due to covalent bonding
7.
Define cohesive forces?
a) The forces, which exist among the molecules of a substance.
b) The forces, which exist among the atoms of a substance.
8.
When the process of dissolution occurs? .................... When cohesive forces among solute molecules are weak appreciably and are overcome by new forces of attraction between solute and solvent -------.
a) atoms
b) molecules
9.
What is meant by absorption of heat? Short..Answer..............Remember.by.Heart..........................
a) When temperature of any thing increases it means it has absorbed heat.
b) When temperature of any thing decreases it means it has absorbed heat.
10.
When the process of dissolution will take place by absorption of heat? .................. When the amount of energy needed to break the cohesive forces among solute molecules exceeds the energy -------- when new forces are wasted.
a) absorbed
b) evolved
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