Допишите ОВР, расставьте коэффициенты:

Na + H2SO4(конц.) = H2S + … + …

Zn + H2SO4(конц.) = S + … + …

Ag + H2SO4(конц.) = SO2 + … + …

Fe + H2SO4(конц.) = SO2 + … + …
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