Question

The concentration of fluoride, lead, nitrate and iron in a water sample 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. Fluoride
• B. Lead
• C. Nitrate
• D. Iron

Answer 1

Answer: (C)

Nitrate

Answer 2

Fluoride $-1000 \,ppm$

Lead - $40 \,ppm$

Nitrate - $100\, ppm$ [ $> 40 \,ppm$ gives blue baby syndrome disease.]

Iron $-0.2 \,ppm$