Question

Which metal does not corrode easily?
      (a) Gold
      (b) Iron
      (c) Aluminium
      (d) Zinc

Answer 1

Hint: Corrosion is a chemical reaction that takes place between metal and oxygen in the presence of moisture. The most active metals which tend to lose electrons easily, corrode easily. Now look for that option which does not corrode easily.

Complete step by step answer:

The process of conversion of pure metal to its oxides, or hydrides or sulfides through natural and biological processes is called corrosion.
When a metal comes in contact with air and water, due to its high reactivity, it gets corroded.
The highly reactive metal undergoes corrosion at a faster rate than the low reactive metal.
Generally Noble metals like Ruthenium (Ru), Rhodium (Rh), Palladium (Pd), Silver (Ag), Osmium (Os), Iridium (Ir), Platinum (Pt), and Gold (Au) are less prone to corrosion.

 Therefore, the correct answer is option A.

Note: Iron is a very strong metal but does corrode very easily resulting in the formation of rust. Rust causes metals to become brittle. To create rust resistance iron is often coated or mixed with metals that do not corrode easily such as nickel. Some metals do not form protective coatings. when iron coatings corrode a flaky layer of rust forms. Rust can always lift away, allowing the metal beneath to corrode.