# All terrestrial planets have iron

Chemistry Level 1

A terrestrial planet, telluric planet or rocky planet is a planet that is composed primarily of silicate rocks or metals. (Iron is very commonly present in rocky planets like Earth.) But like other group 8 elements, iron exists in a wide range of oxidation states. The following reaction formula can appear in the process of iron production: $\ce{Fe_2{O}_3} + 3\ce{CO} \ce{->} 2\ce{Fe}+3\ce{CO_2}.$ What is the change in the oxidation number of iron ($\ce{Fe}$) before and after the reaction?

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