(I ) milliliters per minute (2) parts per million (3) grams per Kelvin (4) joules per gram
(2) parts per million ;
The correct answer is (2) Parts per million (ppm), which is used to express the concentration of a solution, especially in cases of very low solute levels. Other options like milliliters per minute, grams per Kelvin, and joules per gram do not pertain to the concentration of solutions. Understanding ppm is essential for fields such as chemistry and environmental science.
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