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What causes runt to form​

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When acidic substances (including water) come in contact with metals, such as iron and/or steel, rust begins to form. Rust is the result of corroding steel after the iron (Fe) particles have been exposed to oxygen and moisture (e.g., humidity, vapor, immersion).12 Sep 2016

Rust is the common name of the chemical called iron oxide. Technically, it's iron oxide hydrate, because pure iron oxide isn't rust. Rust forms when iron or its alloys are exposed to moist air. The oxygen and water in air react with the metal to form the hydrated oxide.

Answer:

Rust is an iron oxide, a usually reddish-brown oxide formed by the reaction of iron and oxygen in the catalytic presence of water or air moisture. Rust consists of hydrous iron(III) oxides (Fe₂O₃·nH₂O) and iron(III) oxide-hydroxide (FeO(OH), Fe(OH)₃), and is typically associated with the corrosion of refined iron.

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