$3.$ What is the function of a flocculant in water treatment?

a$)$ To disinfect water

b$)$ To remove turbidity

c$)$ To form flocs from suspended particles

d$)$ To adjust pH

Which of the following is NOT a common disinfectant used in water treatment?

a$)$ Chlorine

b$)$ UV radiation

c$)$ Ozone

d$)$ Hydrogen peroxide

Which process involves the separation of dissolved salts from water using a semi$-$permeable membrane?

a$)$ Filtration

b$)$ Distillation

c$)$ Reverse osmosis

d$)$ Coagulation

What is the primary mechanism of reverse osmosis?

a$)$ Diffusion of solutes through a membrane

b$)$ Pressure$-$driven movement of water molecules

c$)$ Electrophoretic separation of ions

d$)$ Adsorption of contaminants onto a surface