# What are two examples of oxidation reduction reactions?

Jun 25, 2017

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

#### Explanation:

${\stackrel{- I V}{\text{ CH"_4(g) + stackrel(0)O_2(g) rarr stackrel(+IV)" CO"_2(g) + 2"H}}}_{2} O \left(g\right) + \Delta$

Dioxygen gas has been reduced from $\stackrel{0}{O}$ to $\stackrel{- I I}{O}$

For general information on oxidation numbers see here.

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

$\text{MnO"_4^(-) +"8H"^(+) + "5e"^(-) rarr "Mn"^(2+) "+ 4H"_2"O}$

Deep red permanganate anion is reduced to almost colourless $M {n}^{2 +}$ or...........

$\text{Cr"_2"O"_7^(2-) +"14H"^(+) +"6e"^(-) rarr"2Cr"^(3+) + "7H"_2"O(l)}$

Here orange-red dichromate is reduced to green $C {r}^{3 +}$...