Which of the following is rust?
A. Sodium oxide
B. Iron oxide
C. Silver oxide
D. Copper oxide
Explanation:
Rust is a common term used to describe the corrosion of iron and steel, which results in the formation of iron oxide. Rust is typically a reddish-brown substance that forms on the surface of iron or steel when it is exposed to moisture and oxygen for an extended period of time. This process of corrosion can weaken the metal and cause it to break down over time. The other options listed (A. Sodium oxide, C. Silver oxide, and D. Copper oxide) are not commonly referred to as rust and are the oxides of different elements.
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