How many of the following in dinking 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. 5B. 2C. 3D. 6

How many of the following in dinking water below 30 ppm do not cause a

1.	How many of the following in dinking 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. 5B. 2C. 3D. 6
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How many of the following in dinking 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. 5B. 2C. 3D. 6

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