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

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

• Density of water decreases with a rise in temperature.
• Water expands when heated above $4°\mathrm{C}$.
• Therefore, this statement is correct.

(b) Rubber contracts on heating

• Rubber is a polymer.
• It has chains that break on heating.
• This leads to a decrease in the intermolecular distance and hence rubber contracts.
• Therefore, this statement is correct.

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

• Density of water is highest at $4°\mathrm{C}$.
• Water contracts on heating from $0°\mathrm{C}$ to $4°\mathrm{C}$
• Therefore, this statement is correct.

(d) Water expands on freezing

• Density of ice is less than the density of water.
• Water expands on freezing.
• Therefore, this statement is correct.

The explanation for the incorrect options:

(A) b) is correct

• Statement (b) is correct.
• Statement (a), (c), and (d) are also correct.
• Therefore, this option is incorrect.

(B) c) and a) are false

• Statement (c) and (a) is true.
• Therefore, this option is incorrect.

(C) Only a) is correct

• Statement (a) is correct.
• Statement (b), (c), and (d) is also correct.
• Therefore, this option is incorrect.

Hence, the correct option is (D) All are correct.