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प्रश्न
State two conditions necessary for rusting of iron.
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उत्तर
- The presence of water and oxygen is essential for the rusting of iron.
- Impurities in the iron, the presence of the water vapor, acids, salts and carbon dioxide hastens rusting.
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संबंधित प्रश्न
What is anodising? Give its applications.
Explain why, iron sheets are coated with zinc.
Name an alloy of copper. State its chemical composition and any one use.
Explain why, the galvanised iron article is protected against rusting even if the zinc layer is broken.
No chemical reaction takes place when granules of a rusty-brown solid A are mixed with the powder of another solid B. However, when the mixture is heated, a reaction takes place between its components. One of the products C is a metal and settles down in the molten state while the other product D floats over it. It was observed that the reaction is highly exothermic.
(a) What could the solids A and B be?
(b) What are the products C and D most likely to be?
(c) Write the chemical equation for the reaction between A and B leading to the formation of C and D. Mention the physical states of all the reactants and products in this equation and indicate the heat change which takes place.
(d) What is the special name of such a reaction? State one use of such a reaction.
(e) Name any two types of chemical reactions under which the above reaction can be classified.
What is corrosion? What are necessary conditions for corrosion?
Write three methods of preventing rusting of iron.
Observe the following diagram and give answers.
- Name this method of prevention of corrosion.
- For prevention of which metal this method is used?
- What is used as anode in this method?
Galvanisation is a process used to prevent the rusting of which of the following?
Explain the chemical reactions in rusting of iron.
