When the same element is both oxidized and reduced in a given reaction, disproportionation is said to occur. In which of the following reactions does disproportionation occur?
A) Hg (l) + 2 H2SO4 (aq) � HgSO4 (s) + SO2 (g) + 2 H2O (l)
B) 2 H2O2 (l) � 2 H2O (l) + O2 (g)
C) CaCO3 (s) + H2O (l) + CO2 (aq) � Ca(HCO3)2 (aq)
D) SO2 (g) + H2O (l) � H2SO3 (aq)
E) None of these reactions are disproportionation processes.
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