Assertion :The concentration of pollutants in water or atmosphere is often expressed in terms of ppm. Reason: Concentration in parts per million can be expressed as mass to mass, volume to volume and mass to volume

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Ppm means a mass of chemical contaminant per unit volume of water.
Concentration can also be expressed as mass to volume, mass to mass or volume to volume.
For most of the pollution work, the pollutant concentrations are expressed in volumetric terms, i.e; parts per million.

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