[amp_mcq option1=”Emulsification” option2=”Absorption” option3=”Adsorption” option4=”Coagulation” correct=”option4″]
The correct answer is D. Coagulation.
Coagulation is the process of destabilising a colloid, in this case muddy water, by adding a coagulant, in this case alum. The coagulant causes the particles in the colloid to stick together and form larger particles, which can then be removed by sedimentation or filtration.
Emulsification is the process of forming an emulsion, which is a mixture of two immiscible liquids, such as oil and water. Absorption is the process of a substance taking in another substance, such as a liquid or gas, on its surface. Adsorption is the process of a substance taking in another substance, such as a gas or liquid, onto its surface.
In the case of muddy water, the particles in the water are suspended in the water and are not able to settle out. The addition of alum causes the particles to coagulate, or stick together, forming larger particles that can then be removed by sedimentation or filtration.