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Ca +2 HCl => CaCl2 + H2
Ca0 + 2HCl ========> H20 + CaCl2
nie możliwe tlenek kwasowy nie istnieje
2. Na0H + HNO3 = > NaNO3 + H20
2Na + 2HNO3 => 2NaNO3 + H2
Na20 + 2HNO3 => 2NaNO3 + H20
2NaOH + N205 => 2NaNO3 + 2H20