Discussion
Assertion (A) : Ice floats on water.
Reason (R) : Ice combines with surrounding air which leads to increase in buoyancy.
Answer: C
(A) is true, but (R) is false.
Ice does float on water. The reason is density: when water freezes, hydrogen bonds hold the molecules in an open hexagonal lattice, so ice takes up about 9% more volume than the same mass of liquid water and is less dense. An object less dense than water floats.
Ice does not 'combine with surrounding air' to gain buoyancy. Clear ice with no trapped air still floats, so the reason given is false.
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