Assertion (A): Ice floats on water.
Reason (R): Ice is denser than water.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Assertion (A) is correct, but Reason (R) is not correct.
In an Assertion-Reason question, each statement is checked for truth first, and then R is tested as the cause of what A describes.
Assertion — correct. A piece of ice put in water floats, with most of it under the surface.
Reason — not correct. Ice is less dense than water. An object denser than water would sink, so ice floats precisely because it is lighter, volume for volume, than water.