Ответ. 3, 4
3) H2SO4 + Ca= CaSO4+ H2
4) H2SO4+ 2NaOH= Na2SO4+ 2H2O
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Ответ. 3, 4
3) H2SO4 + Ca= CaSO4+ H2
4) H2SO4+ 2NaOH= Na2SO4+ 2H2O