Question

What are two examples of oxidation reduction reactions?

Answer 1

Well combustion of hydrocarbons........is a good example.......

Explanation:

`stackrel(-IV)" CH"_4(g) + stackrel(0)O_2(g) rarr stackrel(+IV)" CO"_2(g) + 2"H"_2O(g) + Delta`

Dioxygen gas has been reduced from `stackrel(0)O` to `stackrel(-II)O`

For general information on oxidation numbers see here.

And reduction of high valent metals, for which I will only present the reduction half-equation.......

`"MnO"_4^(-) +"8H"^(+) + "5e"^(-) rarr "Mn"^(2+) "+ 4H"_2"O"`

Deep red permanganate anion is reduced to almost colourless `Mn^(2+)` or...........

`"Cr"_2"O"_7^(2-) +"14H"^(+) +"6e"^(-) rarr"2Cr"^(3+) + "7H"_2"O(l)"`

Here orange-red dichromate is reduced to green `Cr^(3+)`...