<span>1) H2S + 4Cl2 + 4H2O ---> H2SO4 + 8HCl
</span><span>2) 2MnCl2 + 4KOH + KBrO --->2MnO(OH) + KBr + H2O + 4KCl</span><span>
</span>
<span>а) 2PbS+ 3O</span>₂<span> → 2PbO + 2SO</span>₂<span> ↑
б) Сr</span>₂<span>O</span>₃<span> + 2Al → Al</span>₂<span>O</span>₃<span> + 2Cr
в) Fe</span>₂<span>O</span>₃<span> + Na</span>₂<span>CO</span>₃<span> → 2Na</span>Fe<span>O</span>₂<span>+ CO</span>₂<span> ↑</span>