Single Answer MCQ
Q-00040043
What happens when soap is mixed with hard water?
1
It forms a solution.
2
It produces scum.
3
It enhances cleaning.
4
It dissolves completely.
Answer and Solution
Answer
B. It produces scum.
Solution:
When soap is added to hard water, the calcium and magnesium ions react with the soap to form insoluble salts, known as scum. This reduces the effectiveness of soap in cleaning.
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