The new chemical substance that is formed during rusting is ______.

aluminium oxide

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iron oxide

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sodium oxide

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magnesium oxide

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Solution

The correct option is B iron oxide
Original iron articles are shiny when new, but when left in open, iron reacts with air and moisture. As a result, a flaky brown layer of iron oxide forms on its surface. This process is called the rusting of iron. The reddish-brown layer is known as rust.
Iron + Air+ Moisture $\to$ Iron oxide (Rust)

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