Civil Engineering - Building Materials - Discussion
Discussion Forum : Building Materials - Section 6 (Q.No. 25)
25.
Pick up the correct statement from the following:
Discussion:
1 comments Page 1 of 1.
Alok damre said:
8 months ago
The correct statement is:
Ultimately hydrated ferric oxide is formed during rusting, and carbon dioxide gets liberated.
Rusting is caused due to the combined action of air, moisture, and carbon dioxide:
Incorrect because carbon dioxide is not a necessary component for rusting. Rusting primarily requires oxygen (air) and moisture (water). Carbon dioxide can play a role in the formation of bicarbonates, but it is not essential for rusting itself.
During rusting, first ferrous bicarbonates are formed:
Incorrect because ferrous bicarbonates are not formed during rusting. Instead, rusting begins with the formation of ferrous ions (Fe²⁺), which combine with hydroxide ions to form ferrous hydroxide (Fe(OH)₂). This later oxidizes to ferric hydroxide and eventually hydrated ferric oxide (rust).
On further oxidation, ferrous bicarbonates get converted to ferric bicarbonates:
Incorrect because ferrous bicarbonates and ferric bicarbonates are not part of the standard rusting process. Rusting involves the oxidation of ferrous hydroxide to ferric hydroxide, which then forms hydrated ferric oxide (Fe₂O₃·xH₂O). Carbonates are not directly involved in the primary rusting process.
Ultimately hydrated ferric oxide is formed during rusting, and carbon dioxide gets liberated.
Rusting is caused due to the combined action of air, moisture, and carbon dioxide:
Incorrect because carbon dioxide is not a necessary component for rusting. Rusting primarily requires oxygen (air) and moisture (water). Carbon dioxide can play a role in the formation of bicarbonates, but it is not essential for rusting itself.
During rusting, first ferrous bicarbonates are formed:
Incorrect because ferrous bicarbonates are not formed during rusting. Instead, rusting begins with the formation of ferrous ions (Fe²⁺), which combine with hydroxide ions to form ferrous hydroxide (Fe(OH)₂). This later oxidizes to ferric hydroxide and eventually hydrated ferric oxide (rust).
On further oxidation, ferrous bicarbonates get converted to ferric bicarbonates:
Incorrect because ferrous bicarbonates and ferric bicarbonates are not part of the standard rusting process. Rusting involves the oxidation of ferrous hydroxide to ferric hydroxide, which then forms hydrated ferric oxide (Fe₂O₃·xH₂O). Carbonates are not directly involved in the primary rusting process.
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