1) <span>2H2S + 3O2 = 2SO2 + 2H2O</span>
<span>2) <span>2SO2 + Ca(OH)2 = Ca(HSO3)2</span></span>
<span><span>3) <span>Ca(HCO3)2 + 2HCl = CaCl2 + 2H2O +2CO2<span>↑</span></span></span></span>
<span><span><span><span>3) <span>CaCl2 + Na2CO3 = CaCO3↓ + 2NaCl</span></span></span></span></span>
<span><span><span><span><span>4) <span>CaCO3 + 2HCl = CaCl2 + CO2↑ + H2O</span></span></span></span></span></span>
Ответ 3. серебро+ вода = водород+ оксид серебра.
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