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GK QUESTION#3206

In the context of NCERT’s introductory discussion of pH in everyday life, which statement is correct?

  1. ALiving organisms can survive a wide range of pH change.
  2. BWhen pH of rain water is less than 8.2, it is called acid rain.
  3. COur body works within the pH range of 7.0 to 7.8.Correct answer
  4. DTooth decay starts when the pH of the mouth is lower than 1.5.
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Answer

C. Our body works within the pH range of 7.0 to 7.8.

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Explanation

NCERT gives 7.0–7.8 as its broad textbook statement about the human body, making C the intended answer in that context. This is not a universal healthy pH interval for every body fluid. The same text uses below 5.6 for acid rain and about 5.5 for tooth-enamel demineralisation, rather than the values in B and D.

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