Iron rusts quickly in – (1) Rain water (2) Sea water (3) Distilled water (4) River water

Iron rusts quickly in – (1) Rain water (2) Sea water (3) Distilled water (4) River water
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(2) Sea water 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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When iron rusts, its weight – (1) decreases (2) increases (3) remains the same (4) first increases and then decreases

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