Discussion
Common methods used for the desalination of water are:
Answer: D
The common methods of desalinating water are distillation (the water is evaporated and condensed, leaving the salts behind), reverse osmosis (water is forced through a semi-permeable membrane at a pressure above the osmotic pressure) and electrodialysis (ions are drawn out of the water through ion-selective membranes in an electric field). Filtration, by itself, removes suspended solids but not dissolved salts, so the options that list it are wrong.
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