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<strong>ZINC</strong>, <strong>CADMIUM</strong>, <strong>AND</strong> <strong>MERCURY</strong><br />
• It becomes extremely hazardous in the biosphere<br />
because there are bacteria that convert it to the<br />
exceedingly toxic CH 3 Hg+ ion<br />
• Mercury is readily lost from aqueous solutions of<br />
mercuric salts owing to reduction by traces of reducing<br />
materials and by disproportionation of Hg 2+ 2