Я думаю правильный ответ Fe2O3
<span>K</span>⁺<span>Cl</span>⁻<span>, S</span>⁺⁶<span>O3</span>⁻²<span> H2</span>⁺<span>S</span>⁻²<span>, H</span>⁺<span>NO3</span>⁻<span>, N</span>⁺⁶<span>O3</span>⁻²<span>, Al</span>⁺³<span>I3</span>⁻<span>, Na3</span>⁺<span>PO4</span>⁻³<span>, K2</span>⁺<span>CO3</span>⁻²<span>.</span>
FeCl3-один атом железа и 3 хлора
4)сульфатом цинка..........................