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One French unit is equal to __________ ppm.

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One French unit is equal to __________ ppm.

(a) 10

(b) 20

(c) 30

(d) 40
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The correct answer is (a) 10

Explanation: One French unit is equal to the 10ppm. Hardness causing salt as the number of parts of the substance by weight in million parts by weight of water is ppm.
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