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` 3Fe + 8HNO_3 \to 3Fe(NO_3)_2+ 2NO + 4H_2O` (1) ` Fe + 4HNO_3 \to Fe(NO_3)_2+ 2NO_2 + 2H_2O` (2) Khi nào xảy ra phản ứng `(1)` , khi nào xảy ra phản ứng `(2)`?
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