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  4. The hardness of a water sample (in terms of equivalents of CaCO3) containing 10-3 M CaSO4 is: (molar mass of CaSO4 = 136 g mol-1)

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Q. The hardness of a water sample (in terms of equivalents of $CaCO_3$) containing $10^{-3} \; M \; CaSO_4$ is :
(molar mass of $CaSO_4 = 136 \; g \; mol^{-1}$)

JEE MainJEE Main 2019Hydrogen

Solution:

ppm of $CaCO_{3}$
$(10^{-3} \times 10^3) \times 100 = 100 \; ppm$