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The drinking water can have the magnesium limit about ____________

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The drinking water can have the magnesium limit about ____________

(a) 10-150ppm

(b) 20-150ppm

(c) 30-150ppm

(d) 40-150ppm

This question was addressed to me in exam.

My doubt is from Estimation of Hardness topic in division Water of Applied Chemistry

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The correct choice is (c) 30-150ppm

The best I can explain: The drinking water can have the magnesium limit about 30-150ppm. The calcium in the drinking water can be about 75-200ppm.

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