Post-UTME Chemistry 2012 Objective — Question 7
Question 7 of 11 from the Post-UTME Screening (Post-UTME) Chemistry 2012 Objective paper, with the correct answer and a full explanation.
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In the purification of town water supply, alum is used principally to
- A. kill bacteria
- B. control the pH of water
- C. improve the taste of the water
- D. coagulate small particles of mudCorrect
Explanation
Alum acts as a coagulant/flocculant, clumping together suspended fine particles so they can settle or be filtered out. (No printed answer key for this session; answer worked out independently.)
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