Physical and Chemical Changes Quiz

Identify the odd one out in the context of physical changes:

• Melting of ice

• Boiling of water

• Breaking of glass

• Burning of coal

Arrange the following steps of water treatment in the correct order:

i) Sedimentation
ii) Filtration
iii) Chlorination
iv) Coagulation

• iv → i → ii → iii

• i → iv → ii → iii

• iv → ii → i → iii

• ii → i → iv → iii

Assertion (A): Rusting is faster in rainy seasons.

Reason (R): Rusting requires both oxygen and moisture.

• Both A and R are true, and R is the correct explanation.

• Both A and R are true, but R is not the correct explanation.

• A is true, R is false.

• A is false, R is true.

Match the Following:

Column A : A. Boiling, B. Respiration, C. Rusting, D. Freezing

Column B: 1. Exothermic change, 2. Physical and reversible, 3. Chemical and irreversible and require moisture, 4. Physical and reversible

• A–2, B–1, C–3, D–4

• A–1, B–2, C–4, D–3

• A–2, B–3, C–1, D–4

• A–3, B–1, C–2, D–4

A student places an iron nail in blue copper sulfate solution. After 30 minutes, he observes a color change and a reddish-brown deposit. What kind of reaction is this?

• Combination

• Decomposition

• Displacement

• Neutralization

Choose the reaction that is endothermic, while others are exothermic:

• Neutralization of acid and base

• Respiration

• Photosynthesis

• Combustion of fuel

Put the rusting steps in order:

i) Exposure to moist air
ii) Oxidation of iron
iii) Formation of Fe₂O₃·xH₂O
iv) Presence of water

• i → iv → ii → iii

• iv → i → iii → ii

• i → ii → iv → iii

• ii → i → iv → iii

Why is boiling not a chemical change?

• Water molecules split

• A new substance is formed

• Change is irreversible

• No new substance is formed

Which combination is correctly matched in the context of potable water?

• Distillation – Removes suspended particles

• Filtration – Removes bacteria

• Boiling – Kills microorganisms

• Sedimentation – Removes dissolved salts

Which change is most likely to release energy that can be used by living organisms?

• Photosynthesis

• Boiling

• Respiration

• Rusting