A) Rain water
B) Sea water
C) Distilled water
D) River water
Correct Answer: B
Solution :
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 reversed and in effect the zinc corrodes rapidly, protecting the Iron.
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