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Air and Atmosphere — CHEMISTRY STD 7 — Question

ICSE BoardEnglish MediumSTD 7CHEMISTRYAir and Atmosphere1 Mark
Question
What is rust ?
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Answer

Rust:Rust is hydrated ferric oxide ($Fe_2O_3. x* H_2O$), which forms a brownish red coating over iron. (* x can be any number.)

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