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प्रश्न
Tiffin boxes are electroplated with ______ but car bumpers are electroplated with ______ to protect them from rusting.
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उत्तर
Tiffin boxes are electroplated with tin but car bumpers are electroplated with chromium to protect them from rusting.
Explanation:
Tin is used for tiffin boxes because it is non-toxic and does not react with food acids, making it completely safe for storing meals. On the other hand, chromium is used for car bumpers because it provides a shiny, decorative finish while being highly resistant to scratches and weather wear. Both coatings effectively shield the underlying iron or steel from air and moisture, preventing rust.
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संबंधित प्रश्न
Give two examples of alloys with their chemical composition.
What are alloys?
Give reasons:
Platinum, gold and silver are used to make jewellery.
What special name is given to the corrosion of iron?
State two conditions for the rusting of iron.
The corrosion of iron is called ______.
Name the metal which is a constituent of plant pigment?
Explain how the activity series accounts for each of the following:
tendency to corrosion
State under what conditions corrosion is faster ?
Corrosion can be an advantage in some case.Explain ?
No chemical reaction takes place when granules of a 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.
(i) Based on the given information make an assumption about A and B and write a chemical equation for the chemical reaction indicating the conditions of reaction, physical state of reactants and products and thermal status of reaction.
(ii) Mention any two types of reactions under which above chemical reaction can be classified.
State whether the statement given below is true or false. If false write the correct statement.
Either oxygen or moisture is essential for rusting.
What is rust?
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.
Amalgam is an alloy of ____________.
The table shown below gives information about four substances: A, B, C and D.
| SUBSTANCE | MELTING POINT (K) | ELECTRICAL CONDUCTIVITY | |
| SOLID | LIQUID/ AQUEOUS | ||
| A | 295 | Good | Good |
| B | 1210 | Poor | Good |
| C | 1890 | Poor | Good |
| D | 1160 | Poor | Poor |
Identify Ionic compounds from the above given substances.
Alloys are homogeneous mixtures of a metal with a metal or non-metal. Which among the following alloys contain non-metal as one of its constituents?
Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg), treated with HNO3, hydrogen is not liberated, why?
Give scientific reasons.
Silver amalgam is used for filling dental cavities.
