Ответ:
K2S + Pb(NO3)2 → PbS + 2 KNO3
2 NaCl+ CaCO3 → Na2CO3 + CaCl2
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Ответ:
K2S + Pb(NO3)2 → PbS + 2 KNO3
2 NaCl+ CaCO3 → Na2CO3 + CaCl2