12. What happens when we throw substances in rivers and streams, and they do not dissolve?

A. It can end up destroying and entire food chain of aquatic life.
B. Toxic waste harms organisms in the rivers.
C. It can contribute to water pollution.
D. Contamination of groundwater.

13. Crystal of solute were dissolved in warm water until most of them disappeared. Then, the solution was cooled with ice water crystal reformed. What factor/s affected the solubility of the substance?

A. Nature of solute and solvent.
B. Molecular size and pressure.
C. Temperature, pressure, and molecular size.
D. Polarity, temperature, pressure, nature of solute and solvent.

14. What is the fundamental principle of solvation process?

A. Like dissolves like.
B. Ions are surrounded by a concentric shell of solvent.
C. It is a process of reorganizing solvent and solute molecules.
D. The process of attraction and association of molecules of a solvent with molecules or ions of a solute.
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