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प्रश्न
A 500 g toothpaste sample has 0.2 g fluoride concentration. What is the concentration of fluorine in terms of ppm level?
पर्याय
250
200
400
1000
MCQ
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उत्तर
400
Explanation:
Given: Mass of fluoride (solute) = 0.2 g
Mass of toothpaste (sample/solution) = 500 g
We know that
ppm = `"mass of solute"/"mass of solution" xx 10^6`
ppm = `0.2/500 xx 10^6`
ppm = 400
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