The commercial production of nitric acid involves the following chemical reactions:
(a) 4NH3(g) + 5O2(g) → 4 NO(g) + 6H20(g)
(b) 2NO(g) + 02(g) → 2NO2(g)
(c) 3NO2(g) + H20(l) → 2HNO3(aq) + NO(g)
Which of these reactions are redox reactions?
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