Question : The hardness of water is expressed in terms of:
Option 1: mole
Option 2: molarity
Option 3: Parts per million
Option 4: normality
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Correct Answer: Parts per million
Solution : The correct option is Parts per million .
Parts per million (ppm) is the number of units of mass of a contaminant per million units of total mass. It's the weight-to-weight ratio that's employed in concentration descriptions. The amount of a contaminant per million units of total mass is expressed in parts per million (ppm).
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