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In which of the following processes is iron being oxidized? I. Fe + H2SO4 →...

In which of the following processes is iron being oxidized?
I. Fe + H2SO4 → FeSO4 + H2
II. FeSO4 + H2S → FeS + H2SO4
III. 2FeCl2 + Cl2 → 2FeCl3
IV. 2FeCl3 + SnCl2 + SnCl4
A. l and 3
B. 1 only
C. 2 and 4
D. 3 only?

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