Question

Which sentence describes an example of sublimation?
A.Dew forms on leaves on a cold morning.
B.Liquid deodorant sprayed on a person’s body evaporates.
C.Dry ice changes to carbon dioxide when kept in an open container.
D.Ice cream in a bowl melts.
E.Water vapor condenses on a cold surface and forms droplets.

Answer 1

Hello!

Sublimation is when a solid turns right to a gas without any liquid phase.  While $CO_{2}$ does have a liquid phase, dry ice does not go through it; it goes right from a solid to a gas, so it's going to be C.

Answer 2

The correct answer to the question is C).Dry ice changes to carbon dioxide when kept in an open container.

EXPLANATION:

Before answering this question, first we have to understand sublimation.

Sublimation is a thermal process of state or phase change in which solid substance is directly converted into gas without melting i.e the substance won't undergo liquid state.

In the given question, dry ice is given. Dry ice is the solid state of carbon dioxide. When the dry ice changes to carbon dioxide, directly solid carbon dioxide is converted into gaseous carbon dioxide. No liquid carbon dioxide is formed . So, the phase change is from solid to gas.

Hence, the conversion of dry ice into carbon dioxide is an example of sublimation.