Question

the concentration of fluoride , lead ,nitrate and iron in a watersample from an underground lake was found to be 1000 ppb , 40 ppb , 100 ppm and 0.2 ppm , respectively this water is unsuitable for drinking due to high concentration of

A ) lead

B ) nitrate

C ) iron

D ) fluoride

Answer 1

I think answer is B because

this water is unsuitable for drinking due to high concentration of nitrate . in drinking water maximum permissible concentration of

Lead = 20ppb

nitrate = 50ppb

Iron 0.2ppm

fluoride = 1 ppm

Answer 2

Lead = 20ppb 

nitrate = 50ppb

Iron 0.2ppm

fluoride = 1 ppm
 

this water is un suitable for drinking