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In the process of rusting iron, _____________ coloured powder is coated on iron.
4Fe + 3O₂+ 2H₂O $\underset{}{\to}$ 2Fe₂O₃.H₂O

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brown blue

red brown

black

green

answer is D.

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Detailed Solution

When iron metal is exposed to air for a long time, it oxidises and forms a reddish-brown colour iron oxide on its surface. This red-brown substance is known as rust, and the process of forming rust is known as rusting.

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