a
O2 and H2O
b
Ar and CO2
c
CO2 and H2O
d
O2 and CO2
Explanation
Correct Option
aVideo Explanation
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Discussions (8)

BlueBlood77
8 years ago
Rusting only takes place in the presence of oxygen and atmospheric moisture(H2O). Therefore the answer is A

Som15432
1 year ago
Rusting is a process that happens to iron and some other metals when they're exposed to certain things.
* Oxygen (O₂): This is the gas we breathe, and it's also a key player in rusting.
* Water (H₂O): Water, in the form of moisture or liquid, helps the rusting process happen much faster.
So, the correct answer is A. O₂ and H₂O.
Here's why the other options aren't right:
* Argon (Ar) and carbon dioxide (CO₂) are in the air, but they don't directly cause rusting.
* While carbon dioxide and water can make a weak acid, it is still the oxygen and water that directly cause the rust.



