Pb (as Pb²⁺)is
A)toxic at all concentrations.
B)safe at all concentrations.
C)toxic at high concentrations but not at low concentrations.
D)toxic to children but not to adults at high concentrations.

Question

Quizplus · Accepted Answer

Lead (Pb) is toxic and can have harmful effects on human health, especially in high concentrations. However, at low concentrations, it may not cause immediate harm. The World Health Organization has set a safe limit for lead in drinking water at 10 µg/L, which reflects the potential health risks of long-term exposure. Therefore, choice C is the best answer, as it acknowledges that Pb can be toxic at high concentrations but not at low concentrations.

Pb (As Pb²⁺)is