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2Ag(+) + 2NO3(-) + Mg(2+) + S(2-) ->Ag2S + Mg(2+) + 2NO3(-)
2Ag(+) + S(2-) ->Ag2S
b)H2CO3+CaCl2->CaCO3(osad)+2HCl
2H(+) + CO3(2-) + Ca(2+) + 2Cl(-) ->CaCO3 + 2H(+) + 2Cl(-)
CO3(2-) + Ca(2+)->CaCO3
c)FeSO4+H2S->FeS(osad)+H2SO4
Fe(2+) + SO4(2-) + 2H(+) + S(2-) ->FeS + 2H(+) + SO4(2-)
Fe(2+) + S(2-) ->FeS
d)Fe(NO3)3+3NaOH->Fe(OH)3(osad)+3NaNO3
Fe(3+) + 3NO3(-) + 3Na(+) + 3OH(-) ->Fe(OH)3 + 3Na(+) + 3NO3(-)
Fe(3+) + 3OH(-) ->Fe(OH)3