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NEET levelSingle correct optionDifficulty 1 of 3mc077

A $500 g$ sample of water contains $2.5 mg$ of fluoride ions. The concentration in ppm (by mass) is

A $5$
B $0.5$
C $0.005$
D $50$

Answer: A

ppm = (mass of solute / mass of sample) x

1 0^{6}

= (

2.5 \times 1 0^{- 3}

g / 500 g) x

1 0^{6}

= 5.

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