Which of the following processes is/are spontaneous?
I. Iron in the open air rusts.
II. Liquid water in a freezer turns to ice.
III. A spark ignites a mixture of propane and air.
A)I only
B)I and II only
C)I and III only
D)II and III only
E)I, II, and III are all spontaneous.

Question

Quizplus · Accepted Answer

All the processes listed (I. Iron rusting in open air, II. Liquid water freezing in a freezer, III. A spark igniting a mixture of propane and air) are examples of spontaneous processes. These processes occur without needing continuous energy input from an external source once initiated.

Which of the Following Processes Is/are Spontaneous