Question

All natural processes are:
(A) Spontaneous
(B) Non-spontaneous
(C) Exothermic
(D) Endothermic

Answer 1

Hint: First we know that a natural process is a process existing in or produced by nature. Also natural processes do not use any energy from the outside. The water cycle, natural disturbances (floods, storms, etc), a ball will roll down an incline, water will flow downhill, ice will melt into water, and iron will rust are some examples of natural processes.

Complete Step By Step Answer:
A non-spontaneous process (endergonic process) is a chemical process in which the standard change in free energy is positive, and energy is absorbed from the outside.
The endothermic process absorbs energy from the surrounding, which is in the form of heat. Whereas, an exothermic process releases the energy into the surrounding of the system.
A spontaneous process is a process which occurs without any external input to the system. This process occurs on its own, without any energy used from the outside. Because spontaneous processes are characterized by a decrease in the system's free energy.
So, all natural processes are spontaneous.
Hence the correct option (A).

Note:
Note that, all natural spontaneous processes are irreversible and no natural reversible processes exist. Natural processes are repeating processes among plants, animals, and the environment. In a reversible process, the system changes in such a way that the system and surroundings can come back to their original states by reversing the process.