Answer: Distilled water.
- A Distilled water
- B Rain water
- C Tap water
- D Sea water
Correct answer: A. Distilled water
Explanation: Distilled water has most dissolved impurities removed and is considered very pure for laboratory use.
Each water molecule's O-H bonds (covalent, solid) can hydrogen-bond (dashed) to neighbouring molecules, forming an extended network responsible for water's unusually high boiling point and density anomaly.
Concept context
The simplest and most abundant element in the universe. Study its unique position in the periodic table, isotopes (protium, deuterium, tritium), properties of water and hydrogen peroxide, and industrial uses.