Presence of which makes water unsuitable for drinking.

a) Fe = 0.2 ppm

b) Cu = 2 ppm

c) Mn = 0.5 ppm

d) Zn = 0.05 ppm

Answer: (c)

Fact from NCERT

Presence of Mn ≥ 0.05 ppm concentration makes water unsuitable for drinking

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