12. In the following redox reaction 4NH3 + 3Ca(ClO)2 → 2N2 + 6H2O + 3CaCl2 which element is oxidized and which is reduced?
(A) H is oxidized and N is reduced
(B) N is oxidized and Cl is reduced
(C) N is oxidized and O is reduced
(D)Cl is oxidized and O is reduced

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