1.

Which one of the following elements is least reactive with water

Answer»

Lithium
Sodium
Potassium
Cesium

Solution :Iron corrodes rapidly , because of its non-stable corrosion products on the surface . Rust occurs when metals containing iron reacts with the OXYGEN in the air or in water and form a compound called iron (III) OXIDE (ferric oxide) . This compound contains water molecules,so we call it a hydrated compound . Both oxygen gas and water must be PRESENT for the iron to rust .
CHEMICALLY and very simply speaking , iron atoms lose a few ELECTRONS to oxygen atoms . this processby which electrons are removed from atoms is called oxidation.
When oxidationoccurs , it produces a chemical reaction that creates iron (III) oxide-or rust .


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