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JAMB - Chemistry (2024 - No. 56)

Rust on the surface of a metal sheet contains
hydrated iron(II)oxide
hydrated iron(III)oxide
iron(III)hydroxide
iron(III) trioxocarbonate(IV)

Explicació

Rust on a metal sheet contains iron oxide, which is a compound made of iron, oxygen, and hydrogen: 

  • Chemical formula: The chemical formula for rust is Fe\(_2\)O\(_3\).x H\(_2\)O also known as hydrated Iron(III) oxide.
  • The chemical equation for the rusting of iron is

       4Fe + 3O\(_2\) + xH\(_2\)O → 2Fe\(_2\)O\(_3\)⋅xH\(_2\)O

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