AP EAMCET · Chemistry · Some Basic Concepts of Chemistry
Calculate the concentration of fluorine in ppm in \(500 \mathrm{~g}\) of toothpaste containing \(0.2 \mathrm{~g}\) of fluorine.
- A \(2 \times 10^2\)
- B \(4 \times 10^2\)
- C \(4 \times 10^0\)
- D \(4 \times 10^3\)
Answer & Solution
Correct Answer
(B) \(4 \times 10^2\)
Step-by-step Solution
Detailed explanation
PPM or Parts Per Million is expressed as 1 milligram of substance per kilogram of parent substance. Since, mass of toothpaste \(=500 \mathrm{~g}=0.5 \mathrm{~kg}\), and mass of fluoride ion \(=0.2 \mathrm{~g}=200 \mathrm{mg}, 0.5 \mathrm{~kg}\) toothpaste contains…
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