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JEE Main 20172 April
Exam
JEE Main
Year
2017
Date
2 April
Subject
Chemistry
Chapter
Environmental Chemistry

JEE Main 2017 · 2 April · Chemistry · Environmental Chemistry

A water sample has ppm level concentration of following anions F ^...

A water sample has ppm level concentration of following anions

F−=10;SO42−=100;NO3−=50{F}^{-} = 10; {SO}_{4}^{2 -} = 100; {NO}_{3}^{-} = 50

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

Options

  1. ABoth SO42−{SO}_{4}^{2 -} and NO3−{NO}_{3}^{-}
  2. BOnly F−{F}^{-}
  3. COnly SO42−{SO}_{4}^{2 -}
  4. DOnly NO3−{NO}_{3}^{-}

Correct answer

B. Only F−{F}^{-}

Step-by-step solution

Ions Maximum prescribed
concentration in drinking water

Fluoride 1.5ppm1 . 5ppm

Sulphate 500ppm500ppm

Nitrate 50ppm50ppm

Fluoride ion concentration is more than the limit, so it makes water unsuitable for drinking
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