Which of the following changes is a physical change? MCQ with Answer and Explanation

Which of the following changes is a physical change?
A. Rusting of iron
B. Curdling of milk
C. Burning of coal
D. Boiling of water
Answer: Option D
Solution (By JKSSB Mock Tests)
Boiling water changes state from liquid to gas, but the chemical composition (H₂O) remains unchanged – physical change. Others form new substances.

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Practice More chemistry Questions

Question #1
Soaps are sodium salts of long-chain fatty acids. Which part of soap dissolves in grease?
A. Hydrocarbon tail
B. Ionic head
C. Sodium ion
D. Water molecule

Correct Answer: Option A


Explanation:
The long non-polar hydrocarbon tail is hydrophobic and dissolves in grease/oil. The ionic head (carboxylate) is hydrophilic and interacts with water. This dual nature enables micelle formation and cleaning.

This question belongs to: Science chemistry
Question #2
The force holding ions together in an ionic crystal is:
A. Covalent bond
B. Van der Waals
C. Electrostatic attraction
D. Hydrogen bond

Correct Answer: Option C


Explanation:
Ionic compounds consist of oppositely charged ions held together by strong electrostatic forces (ionic bonds). This results in high melting points and solubility in polar solvents.

This question belongs to: Science chemistry
Question #3
The common name of sodium hydroxide is:
A. Caustic soda
B. Washing soda
C. Baking soda
D. Soda ash

Correct Answer: Option A


Explanation:
NaOH is caustic soda. Washing soda is Na₂CO₃·10H₂O; baking soda NaHCO₃; soda ash anhydrous Na₂CO₃.

This question belongs to: Science chemistry