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Q.

Our body works within the pH range of-

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a

 4 to 6
 

b

7.0 to 7.8

c

5 to 7.0

d

6.5 to 8

answer is B.

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Detailed Solution

  • Every human body works within the pH range of 7.0 to 7.8.
  •  Living organisms are able to survive only in a narrow range of pH change.
  •  When the pH of rain water is less than that of 5.6, it is called acid rain. 
  • When this  acid rain flows into the rivers, it lowers the pH of the river water affecting the survival of aquatic life in such rivers.
     
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Our body works within the pH range of-