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Find the correct statement for ppm

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Find the correct statement for ppm

(a) For solids and liquids, it is mole ratio

(b) For gases, it is mole ratio

(c) It is mole ration for every phase of matter

(d) It is mass ratio for every phase of matter

I have been asked this question in a job interview.

My doubt is from Concentration-I topic in division Introductory Concepts of Chemical Process Calculation

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The correct option is (b) For gases, it is mole ratio

For explanation: For gases, it is mole ratio and for liquids and solids, it is mass ratio.

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