Diantara reaksi-reaksi dibawah ini yang merupakan reaksi oksidasi adalah

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Jawaban: C.

Pembahasan:

Reaksi redoks adalah reaksi yang melibatkan pereaksi yang mengalami reaksi reduksi dan reaksi oksidasi. Pada reaksi oksidasi terjadi kenaikan bilangan oksidasi (biloks), sedangkan pada reaksi reduksi terjadi penurunan biloks.

Berikut analisis reaksi redoks tersebut:

Tentukan biloks yang berubah dari masing-masing atom. Dalam menentukan biloks atom dapat mengikuti aturan sebagai berikut:

biloks senyawa = nol.
biloks unsur bebas = nol.
biloks hidrogen (H) bila berikatan dengan logam = -1. Bila H berikatan dengan non-logam = +1.
Bilangan oksidasi oksigen (O) dalam senyawa proksida = -1. Bilangan oksidasi O dalam senyawa non-peroksida = -2.