(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Water exists in all three states. Discuss.

Why is water considered a compound?

What causes the violence associated with torrential rain?

Which property of water enables it to modify the climate?

What is the effect of impurities present in the water on the melting point and boiling point of water?

How do fishes and aquatic animals survive when the pond gets covered with thick ice?

How is aquatic life benefited by the fact that water has maximum density at 4^oC?

State the importance of the solubility of CO₂ and O₂ in water.

Identify A, B, C and D; first one is done for you.

Explain why rivers and lakes do not freeze easily.

Explain why:

Air dissolved in water contains a higher proportion of oxygen.

Explain why:

If distilled water is kept in a sealed bottle for a long time, it leaves etchings on the surface of the glass.

Explain why:

Rain water does not leave behind concentric rings when boiled.

Define
Henry's law

Explain why:

Water is an excellent liquid to use in cooling systems.

Explain why:

Fused CaCl₂ or conc. H₂SO₄ is used in a desiccator.

Explain why:

Table salts become sticky on exposure to humid air during the rainy season.

What is the composition of water? In what volume its elements combine?

What is the importance of dissolved impurities in water?

What are stalgmites and stalactites? How are they formed?