Consider the following reaction equations. Which is/are redox reactions?
i. Cr(C2H3O2)2 (aq) + 2 NaOH (aq) → 2 NaC 2H3O2 (aq) + Cr(OH)2 (s)
ii. Fe (s) + 4 HNO3 (aq) → Fe(NO3)2 (aq) + 2 NO2 (g) + 2 H2O (l)
iii. B2O3 (s) + 6 KOH (aq) → 2 K 3BO3 (aq) + H2O (l)
A. i only
B. ii only
C. iii only
D. i and ii
E. ii and iii
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