Let's analyze the statements regarding the reaction of iron (Fe) with oxygen (O2) to form iron(III) oxide (Fe2O3):
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The physical properties of Fe2O3 are different from those of Fe and O2.
- True. Fe2O3 has distinct physical properties (e.g., it is a solid, often reddish-brown) that differ from the metallic properties of iron and the gaseous properties of oxygen.
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The physical properties of Fe2O3 are different from those of Fe and O2.
- True. This statement is essentially a repetition of the first statement, so it is also true.
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The physical properties of Fe2O3 are a mixture of those found in Fe and O2.
- False. Fe2O3 is a compound with distinct properties that do not simply represent a mixture of the properties of iron and oxygen; it undergoes a chemical transformation.
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If Fe2O3 is a solid, either Fe or O2 must be a solid.
- False. Fe2O3 being a solid does not require that either Fe or O2 must be a solid, as Fe exists as a solid (metal) and O2 exists as a gas under normal conditions. They can react to form a solid compound without either being a solid themselves at the time of reaction.
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If Fe2O3 is brown, either Fe or O2 must be brown.
- False. The color of Fe2O3, which can be reddish-brown, does not imply that either Fe (which is metallic gray) or O2 (which is colorless) must also be brown. The color of a compound can differ significantly from the colors of its constituent elements.
Based on the analysis:
- The correct statements are:
- The physical properties of Fe2O3 are different from those of Fe and O2.
- The physical properties of Fe2O3 are different from those of Fe and O2. (This is a repeat.)
The false statements are the third, fourth, and fifth.
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