Advertisements
Advertisements
Question
What is done to prevent corrosion of metals?
Advertisements
Solution
Corrosion of metals can be prevented by the following methods:
- Applying coatings: Metals are coated with oil, grease, varnish, or paint to prevent direct contact with air and moisture.
- Metal plating: Metals are plated with a non-corroding metal. For example, zinc plating (galvanization) is used to protect iron from rusting.
RELATED QUESTIONS
Name the metal which is used for galvanising iron.
What is corrosion?
Name five methods of preventing rusting of iron.
Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
Reaction on anode region :
`F_e(s) → Fe^(2+) (aq) +2e^-`
Reaction on anode region :
`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `
When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.
`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `
A way to prevent rusting ..................................................................
Give reason.
A wooden article should be polished.
Observe the following picture and answer the following questions:

- What is rust?
- Write the chemical formula of rust.
- Write the reaction of oxidation of iron at the anode.
- Write the reaction of oxidation of iron at the cathode.
- What is corrosion?
Amalgam is an alloy of ____________.
Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

The substance not likely to contain CaCO3 is:
Give an example of a chemical reaction for the following situation:
Sound is produced
Give scientific reasons.
Silver amalgam is used for filling dental cavities.
