Chemistry - 9 Chapter - 7Solution and SuspensionTest - 3

Chemistry - 9 Chapter - 7
Solution and Suspension
Test - 3

1. When the heat is evolved during the process of dissolution?

a) When the forces of attraction between solute and solvent molecules are weaker then the cohesive forces.
b) When the forces of attraction between solute and solvent molecules are stronger then the cohesive forces.

2. Heat is evolved during the process of dissolution When the forces of attraction between solute and solvent molecules are weaker then the cohesive forces.

a) True
b) False

3. Water is an ______ solvent.

a) Good
b) Excellent
c) Very good
d) Fair

4. Why water dissolves almost everything in it?

a) Because of being polar molecule, water dissolve, almost all the ionic compounds in it.
b) Because of being ionic molecule, water dissolve, almost all the ionic compounds in it.

5. When sodium chloride and water are mixed a large amount of energy is:

a) Needed
b) Absorbed
c) Realeased

6. Why energy is released when sodium chloride and water are mixed?

a) Because the forces of attraction between sodium chloride and water molecules are stronger then the cohesive forces.
b) Because the forces of attraction between sodium chloride and water molecules are weaker then the cohesive forces.

7. What is meant by word hydration?

a) The process of adding water to a chemical compound so that different crystals are formed.
b) The process of adding water to a chemical compound so that different crystals are dissolved.

8. What is a crystal?

a) A Regular and geometrically shaped particles of a solid as sugar, containing an internal pattern of atoms, molecules, or ions.
b) A regular and geometrically shaped particles of a solid or gas, containing an internal pattern of atoms, molecules, or ions.

9. What is an ion?

a) An atom or group of atoms that has acquired an electric charge by losing or gaining one or more electrons
b) An atom that has acquired an electric charge by losing or gaining one or more electrons

10. A compound that contains water is called a hydrated compound.

a) True
b) False

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