A water sample has ppm level Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:

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Mn. Drinking-water limits (ppm): Fe ~0.3, Cu ~1-3, Zn ~5, but Mn ~0.05-0.1. Mn = 5.0 ppm exceeds its limit by ~50-100x, making the water unsuitable. Answer: Mn.

A water sample has ppm level Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is:

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