JEE Main20238 Apr 2023Morning ShiftChemistryEnvironmental ChemistryActual
Match List I with List II List-I Species List-2 Maximum allowed concentration in ppm in drinking water A F - I < 50 ppm B SO 4 2 - II < 5 ppm C NO 3 - III < 2 ppm D Zn IV < 500 ppm Choose the correct answer from the options given below.
Options
- AA-I, B-II, C-III, D-IV
- BA-II, B-I, C-III, D-IV
- CA-IV, B-III, C-II, D-I
- DA-III, B-II, C-I, D-IV
Correct answer
D. A-III, B-II, C-I, D-IV
Step-by-step solution
Species Maximum allowed concentration in ppm in drinking water A. F - 2 B. SO 4 2 - 500 C. NO 3 - 50 D. Zn   5 F –   ion concentration above 2 ppm causes brown mottling of teeth. At the same time, excess fluoride (over 10 ppm) causes harmful effect to bones and teeth. Excessive sulphate (>500 ppm) in drinking water causes laxative effect, otherwise at moderate levels it is harmless. The maximum limit of nitrate in drinking water is 50 ppm. Excess nitrate in drinking water can cause disease such as m