Post-UTME Chemistry 2017 Objective — Question 11
Question 11 of 20 from the Post-UTME Screening (Post-UTME) Chemistry 2017 Objective paper, with the correct answer and a full explanation.
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The cleansing action of soap in hard water is not satisfactory because soap
- A. is a salt of fatty acids
- B. is not a detergent
- C. forms insoluble saltsCorrect
- D. forms soluble salt
Explanation
In hard water, soap reacts with calcium and magnesium ions to form insoluble scum (salts), reducing its cleansing effectiveness.
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