Given graph shows the pH of water samples collected from different areas (L, M, N, O and P) of a city. Identify the area(s) which receive(s) hard water and select the correct option.

L and O only

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M only

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N and P only

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L, N, O and P

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Solution

The correct option is C N and P only
The acidic pH indicates polluted water while alkaline pH indicates the hardness of water. According to the graph, the pH of L is 4.5, M is 7, N is 9, O is 5 and P is 10. So, the areas that receive hard water are N and P only.

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