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प्रश्न
Name five methods of preventing rusting of iron.
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
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Give the constituents and one use of brass.
What are the constituents of stainless steel?
Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
Brass is an alloy of:
(a) Cu and Sn
(b) Cu and Pb
(c) Pb and Sn
(d) Zn and Cu
Four metals P, Q, R and S are all obtained by the reduction of their oxides with carbon. Metal P is used to form a thin layer over the sheets of metal S to prevent its corrosion. Metal Q is used for electroplating tiffin boxes made of metal S whereas metal R is used in making car batteries. Metals Q and R form an alloy called solder. What are metals P, Q, R and S? How have you arrived at this conclusion?
Compare roasting and calcination.
Observe the following picture a write down the chemical reaction with the explanation.
What is done to prevent corrosion of metals?
What are the adverse effects of corrosion?
Choose the correct alternative and rewrite the following:
Iron is _____________________.
Stainless steel is an alloy of _______.
Bronze : _______ : : Stainless steel : Fe + Cr + C
Draw a neat labelled diagram.
Electroplating
Draw a neat labelled diagram.
Anodizing
What is rust?
Amalgam is an alloy of ____________.
Give an example of a chemical reaction for each of the following situations:
Sound is produced
In ______ process a layer of molten tin is deposited on metals.
