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Which of the following species containing mercury is the most toxic?

 
CH3Hg+
HgCl2
Hg2Cl2
Hg metal

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The toxic effects of mercury depend on its chemical form and route of exposure. Methylmercury (CH3HG) is the most toxic. Methylmercury is the most toxic among the mercury species because of its volatility and its ability to pass through biological membranes.

Why not Hg metal