Chemistry
Grade-10
Easy
Question
Rusting of iron takes place in
- Ordinary water
- Distilled water
- Both (a) and (b)
- None of the above
Hint:
Both (a) and (b)
The correct answer is: Both (a) and (b)
Rusting of iron takes place in both ordinary and distilled water. The other factor on which rusting of iron depend is humidity as iron requires oxygen in air, water or water vapours for rust. In water iron react with water and oxygen to form hydrated Iron (III) oxide, which we see as rust. Iron and steel rust when they come into contact with water and oxygen, as both are needed for rusting to occur.
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| 1. Iron pyrites | i) ZnS |
| 2. Pitchblende | ii) CaSO42H2O |
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