Some Basic Concepts Of Chemistry Question 44

Question: The ppm level of $ {F^{-}} $ in a 500 g sample of a tooth paste containing $ 0.2g{F^{-}} $ is

Options:

A) 400

B) 1000

C) 250

D) 200

Show Answer

Answer:

Correct Answer: A

Solution:

[a] $ ppm=\frac{wt.,of,solute}{wt.,of,solvent}\times 10^{6} $ $ =\frac{0.2}{500}\times 10^{6}=400 $



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