Which of the following processes is spontaneous?

a). building a house

b). launching a satellite into orbit

c). drops of dye dispersing in a clear solution

d). cleaning your bedroom

e). a ball rolling up a hill

The correct answer for above statement is:

C). drops of dye dispersing in a clear solution

Explanation:

A spontaneous manner is the time-evolution of a system in which it liberates free energy and it influences to a lower, more thermodynamically steady energy state. The symbol convention for free energy follows the usual convention for thermodynamic measurements, in which a statement of free energy from the system compares to an adverse change in the free energy of the system and a positive change in the free power of the surroundings.

a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.