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| Q. |
Iron rusts quickly in – |
| A. | Rain water |
| B. | Sea water |
| C. | Distilled water |
| D. | River water |
| Answer» B. Sea water | |
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Explanation: Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water. This effect can be reversed by using a metal (like zinc) which causes the current to be re-versed and in effect the zinc corrodes rapidly, protecting the iron. |
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