The solid form of a substance is usually more dense than its liquid and gaseous forms. Similarly the liquid form is usually more dense than the gaseous form.

Which of these breaks this general density rule?

Aice floating in a glass of water
Bvapor rising from a hot cup of tea
Ccooled magma sinking in a lava flow
Da hot air balloon falling as the gas inside cools

Verified Answer :

The solid form of a substance is usually more dense than its
liquid and gaseous forms. Similarly the liquid form is usually more dense than
the gaseous form. Ice floating in water is an exception that breaks the general
density rule. So option “A” is the correct option in regards to the given
question. In case of ice formation, actually the density of water decreases by
about 9%. This is the main reason behind ice floating in water. Pure water has
the maximum density at 4 degree centigrade.