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प्रश्न
Name five methods of preventing rusting of iron.
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उत्तर
Five methods of preventing rusting of iron are:
- By polishing the surface of iron with paint
- By applying oil or grease on the surface of iron
- By coating a thin layer of zinc on the iron metal by the process called galvanisation
- By coating other metals like tin coating and chromium coating
- By alloying with other metals (chromium and nickel) to form stainless steel, which does not corrode
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संबंधित प्रश्न
What is an alloy?
Give two examples of alloys with their chemical composition.
What are alloys?
Name the metal which is used for galvanising iron.
State two conditions for the rusting of iron.
Give the constituents and one use of brass.
What are the constituents of stainless steel?
What are the special properties of stainless steel?
Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
Compare roasting and calcination.
Give a reason why rust turns moist red litmus blue.
State whether the statement given below is true or false. If false write the correct statement.
Either oxygen or moisture is essential for rusting.
State whether the statement given below is true or false. If false write the correct statement.
Graphite is a lustrous non-metal which conducts electricity.
Find the odd one out and give its explanation.
Write scientific reason.
Anodization method is useful for prevention of the corrosion of the aluminium.
Write scientific reason.
On exposure to air, silver articles turn blackish after some time.
Write scientific reason.
Coins are made from metals and alloys.
Give the equation for the formation of rust.
Explain the chemical reactions in rusting of iron.
