1.

A water sample has ppm level concentntion of following anions F^(-)=10,SO_(4)^(2-)=100,NO_(3)^(-)=50 the anion/anions that make/makes the water sampleunsuitable for drinking is/are :

Answer»

only `NO_(3)^(-)`
both `SO_(4)^(2-) and NO_(3)^(-)`
only `F^(-)`
only `SO_(4)^(2-)`

Solution :Above 2 ppm CONCENTRATION of `F^(-)` in drinking WATER cause BROWN mottling of TEETH.


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