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How many of the following in drinking wa...

How many of the following in drinking water below 30 ppm do not cause any effect on the body as per international standards of water?
`Pb^(2+),Hg^(2+),Mn^(2+),Cd^(2+),Cl^(-),NO_(3)^(-),SO_(4)^(2),Ca^(2+),Mg^(2+)`

A

5

B

2

C

3

D

6

Text Solution

Verified by Experts

The correct Answer is:
A
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