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Solution


Q.

The pH range most conducive for life of fresh water plants and animals is:
1 6.5–7.5  
2 2.0–3.5  
3 3.5–5.0  
4 9.0–10.5  

Ans.

(1)

A neutral pH is most conducive for life of fresh water plants and animals and the pH range 6.5–7.5 is almost neutral.