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Standard XII
Chemistry
Question

Which of the following is/are true regarding international standards of drinking water?
  1. Fluoride deficiency causes tooth decay.
  2. Required fluoride concentration is 10 ppm.
  3. When fluoride concentration exceeds 20 ppm, brown mottling of teeth occurs.
  4. Excess fluoride (over 100 ppm) has serious effect on bones and teeth.

A
Excess fluoride (over 100 ppm) has serious effect on bones and teeth.
B
Fluoride deficiency causes tooth decay.
C
Required fluoride concentration is 10 ppm.
D
When fluoride concentration exceeds 20 ppm, brown mottling of teeth occurs.
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Solution
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The correct option is A Fluoride deficiency causes tooth decay.
The following are true regarding international standards of drinking water.
Fluoride deficiency causes tooth decay.
Required fluoride concentration is 1 ppm.
When fluoride concentration exceeds 2 ppm, brown mottling of teeth occurs.
Excess fluoride (over 10 ppm) has serious effect on bones and teeth.

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