Single correct option
Consider the following statements about cleaning agents:
1. Soaps are effective in hard water.
2. Synthetic detergents do not form insoluble scum with hard water.
Which of the statements given above is/are correct?
1. Soaps are effective in hard water.
2. Synthetic detergents do not form insoluble scum with hard water.
Which of the statements given above is/are correct?
- A. 1 only
- B. 2 only
- C. Both 1 and 2
- D. Neither 1 nor 2
Show answer and solution
Answer: (B) 2 only
Soap reacts with calcium and magnesium ions of hard water to form insoluble salts called scum, so soap is not effective there. Statement 1 is wrong. Detergent molecules form soluble calcium and magnesium salts, so no scum forms and they work in hard water. Statement 2 is correct.
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