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                              Q:
                           
                           
                                                      | A) Sand and gravel | B) Bad smells | 
| C) Pathogenic microorganisms | D) Particles suspended in water | 
                              Answer:   D) Particles suspended in water
                              
                                                            
                              
Explanation:
                               
                           
                           Explanation:
Coagulation is a chemical process that involves neutralization of charge. Coagulation during water treatment is designed to remove particles suspended in water.
 
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