Chemistry
Grade-10
Easy
Question
What could cause rusting to happen quickly?
- Salty water
- Coat of grease
- Electroplating with another metal
- Burying in muddy ground
Hint:
Rusting occurs due to the presence of moisture.
The correct answer is: Salty water
When iron metal is exposed to air for long time, it oxidizes and forms a reddish brown color iron oxide on its surface. Rusting occurs due to the presence of moisture.
Saltwater accelerates rusting because it behaves as an electrolyte allowing the steel to lose its electrons. Dissolved ions let electrons move more quickly on the steel, causing rust to form.
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