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Question

A 500 g toothpaste sample has 0.2 g of fluoride. The concentration of fluoride ions in terms of ppm level is ___.


A
250 ppm
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B
200 ppm
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C
400 ppm
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D
1000 ppm
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Solution

The correct option is C 400 ppm
Mass of solute (i.e. concentration of F ion) = 0.2 g in 500 g 
Concentration in ppm =weight of fluoride ion(g)total weight of toothpaste (g)×106
Concentration of fluoride ion in ppm =0.2500×106=400 ppm
 

Chemistry

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