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प्रश्न
The process of depositing a thin layer of zinc on iron articles is called ______.
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उत्तर
The process of depositing a thin layer of zinc on iron articles is called galvanisation.
Explanation:
The galvanisation process involves dipping clean iron or steel articles into molten zinc to create a protective barrier coating. The zinc layer prevents rust by shielding the underlying iron from oxygen and moisture in the environment. Even if the zinc coating is scratched, it will corrode first to sacrificially protect the iron.
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संबंधित प्रश्न
Which metals do not corrode easily?
Which of the following methods is suitable for preventing an iron frying pan from rusting?
What type of chemical reaction is involved in the corrosion of iron?
Name any three objects (or structures) which are gradually damaged by the corrosion of iron and steel.
The corrosion of copper produces a ______ coating of basic copper carbonate on its surface.
A common metal which is highly resistant to corrosion is ______.
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?
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
Identify the process shown in the diagram and explain it in short
Answer the following question.
a) What is meant by corrosion?
b) Write names of any two methods of prevention of corrosion.
c) In which method, metal like copper, aluminium are coated with a thin layer of their oxides by means of electrolysis.
d) Explain this method with diagram.
Find the odd man out:
Give reason.
Copper and brass utensils should be tinned.
_______ is an alloy made from iron, carbon and chromium.
Find the correlation:
Bronze : ______ :: Tin : Cu+Zn.
Match the columns.
| Group A | Group B |
| 1) Electroplating | a) Pressure cooker |
| 2) Anodising | b) Silver plated spoons |
| c) Coating of tin on copper | |
| d) Coating of Zinc on iron |
Write a molecular formula for rust.
What is rust?
Give scientific reasons.
Silver amalgam is used for filling dental cavities.
