Multiple choice general knowledge science & technology

Rust on iron is basically _______.

  1. a nitride

  2. a cynaide

  3. an oxide

  4. a sulphide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Rust is iron oxide (Fe2O3·nH2O), formed by oxidation of iron in the presence of oxygen and moisture. It is not a nitride (compound with nitrogen), cyanide (compound with CN-), or sulphide (compound with sulphur). The reddish-brown coating is oxidized iron.

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