K2S + 2HCl → 2KCl + H2S ↑;
CaCO3 + 2HNO3 → Ca(NO3)2 + CO2 ↑ + H2O.
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K2S + 2HCl → 2KCl + H2S ↑;
CaCO3 + 2HNO3 → Ca(NO3)2 + CO2 ↑ + H2O.