Question

Which of the following statements are true?

(a) Water expands on heating from $4°\mathrm{C}$ to $40°\mathrm{C}$.

(b) Rubber contracts on heating.

(c) Water contracts on heating from $0°\mathrm{C}$ to $4°\mathrm{C}$.

(d) Water expands on freezing.

• A. (b) is correct
• B. (c) and (a) are false
• C. Only (a) is correct
• D. All are correct

Answer 1

The correct option is D

All are correct

The explanation for the correct option:

(D) All are correct

Water expands on heating from $4°\mathrm{C}$ to $40°\mathrm{C}$

• Water expands between from $4°\mathrm{C}$ to $40°\mathrm{C}$.
• It has maximum density at $4°\mathrm{C}$.
• Water expands above $4°\mathrm{C}$.
• Therefore, this statement is correct.

Rubber contracts on heating:

• Rubber contracts on heating due to its unusual polymer structure.
• On heating, the long chains of rubber vibrate, and shorten causing contraction of the material.
• Therefore, this statement is correct.

Water contracts on heating from $0°\mathrm{C}$ to $4°\mathrm{C}$ :

• Water has a unique property of anomalous expansion.
• When water is heated from $0°\mathrm{C}$ to $4°\mathrm{C}$ it contracts instead of expanding.
• Volume of water decreases.
• Therefore, this statement is correct.

Hence, all the statements are true and the correct option is (D) All are correct.

The Explanation for the Incorrect options

(A) (b) is correct

• Only (b) is correct is an incorrect option because statements (a) and (c) are also correct.

(B) (c) and (a) are false

• (c) and (a) are false is an incorrect option because statements (c) and (a) are true.

(C) Only (a) is correct

• Only (a) is correct is an incorrect option because statements (b) and (c) are also correct.

Therefore, Option (D) All are correct is the correct answer.