Ответ:
1). K2S + Pb(NO3)2 = PbS + KNO3
2). NaCl + CaCO3 = Na2CO3 + CaCl2
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Ответ:
1). K2S + Pb(NO3)2 = PbS + KNO3
2). NaCl + CaCO3 = Na2CO3 + CaCl2