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Question

A sample of toothpaste weighting 500gm. On analysis was found to contain 0.2 gm of fluorine. The concentration of fluorine in ppm is
  1. 400
  2. 600
  3. 300
  4. 150


Solution

The correct option is A 400
500 — 0.2 g. fluorine
106 — ?
106×0.2500=400 ppm

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