Question

Which of these is a physical process?

(a) Combustion of hydrocarbons

(b) Curdling of milk

(c) Dissolving carbon dioxide in water

(d) Rusting of iron

The question was posed to me in an international level competition.

I'm obligated to ask this question of Biomolecules topic in section Biomolecules of Biology – Class 11

Answer 1

Correct choice is (c) Dissolving carbon dioxide in water

The explanation is: Dissolution of carbon dioxide in water is an example of a physical process. It is reversible. The combustion of hydrocarbons, curdling of milk and rusting of iron are chemical processes.