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Question

Which of the following statements are true?

(a) Water expands on heating from 4°C to 40°C

(b) Rubber contracts on heating

(c) Water contracts on heating from 0°C to 4°C

(d) Water expands on freezing


A

b) is correct

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B

c) and a) are false

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C

Only a) is correct

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D

All are correct

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Solution

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°C to 40°C

  • Density of water decreases with a rise in temperature.
  • Water expands when heated above 4°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°C to 4°C

  • Density of water is highest at 4°C.
  • Water contracts on heating from 0°C to 4°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.


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