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Question

What is the most suitable pH range for fresh water plants and animals?

A
6.5 - 7.5
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B
2.0 - 3.5
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C
3.5 - 5.0
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D
9.0 - 10.5
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Solution

The correct option is A 6.5 - 7.5
The strength of acidic and basic substances is measured with respect to pH scale. The standard value of an acid on a pH scale is between 0 - 7, the substances that are basic have the value ranging between 7 - 14 and for neutral substances the pH is around 7. Since pure water is neither an acid nor a base but neutral, the pH range most suitable can be 6.5 to 7.5.

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