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Question

A water sample has ppm level concentration of following anions

F-=10;SO42-=100;NO3-=50

The anion/ anions that makes the water sample unsuitable for drinking is/are:


A

Only F-

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B

Only SO42-

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C

Only NO3-

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D

Only SO42-andNO3-

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Solution

The correct option is A

Only F-


Answer(A)

Explanation for correct option:

The permissible limit of F- in drinking water is up to 0.5-1ppm.

Excess concentration of F->10ppm causes decay of bones.

Explanation of incorrect option:

(B) The maximum permissible limit of SO4-2 in water is 250ppm. Hence the given concentration is sufficient for drinking water. Therefore, option (B) is incorrect

(C) The maximum permissible limit of NO3- in water is 50ppm. Hence the given concentration is sufficient for drinking water. Therefore, option (C) is incorrect

(D) When (B) and (C) options are wrong, automatically option (D) is incorrect.

Hence option (A) correct option.


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