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प्रश्न
Write three methods of preventing rusting of iron.
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उत्तर
Three methods of preventing rusting of iron:
A. Galvanizing: It is a process of giving a thin coating of zinc on iron or steel to protect them from corrosion, E.g. shiny iron nails. pins etc.
B. Rusting of iron can be prevented by coating it with paint, oil, grease or varnish.
C. Tinning: In this process thin layer of tin is coated over iron objects.
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संबंधित प्रश्न
Give two examples of alloys with their chemical composition.
Explain why rusting of iron objects is faster in coastal areas than in deserts.
What is anodising? Give its applications.
State two conditions for the rusting of iron.
Fill in the following blank with suitable word:
The corrosion of iron is called ................
Fill in the following blanks with suitable words:
Tiffin boxes are electroplated with .............. but car bumpers are electroplated with ............... to protect them from rusting.
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............ and .............. are necessary for the rusting of iron.
Explain why, through aluminium is more reactive than iron, yet there is less corrosion of aluminium when both are exposed to air.
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Name a common metal which is highly resistant to corrosion.
Compare roasting and calcination.
Answer the following question.
List two properties of alloys.
Give a reason why rust turns moist red litmus blue.
Draw a neat labelled diagram.
Anodizing
State two conditions necessary for rusting of iron.
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.
The diagram shows the reaction between metal and dil. acid.
What is the reason for different behaviour of Mg in test tube B?
Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?
State whether the following statement is true or false:
Ships suffer a lot of damage though they are painted.
Describe two changes that are harmful. Explain why you consider them harmful. How can you prevent them?
