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A sample of toothpaste weighting 500 g ,...

A sample of toothpaste weighting 500 g , on analysis was found to contain ` 0.2 g ` of fluorine The concentration of fluorine in ppm is

A

` 4xx 10 ^(3) `

B

` 4xx 10 ^(2) `

C

` 4xx10 `

D

` 2 xx10 ^(2) `

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The correct Answer is:
B
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