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प्रश्न
Name an alloy of copper. State its chemical composition and any one use.
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उत्तर
An alloy of copper is bronze. The constituent elements of bronze are copper and tin.
The composition of bronze is 90 percent copper and 10 percent tin. This alloy of copper is very strong and prevents corrosion.
Bronze is used in the manufacturing of statues, medals, cooking vessels etc.
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संबंधित प्रश्न
Tinning : Tin : : Galvanizing : _________
What special name is given to their corrosion of iron?
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.
A metal X which is resistant to corrosion is produced by the electrolysis of its molten oxide whereas another metal Y which is also resistant to corrosion is produced by the reduction of its oxide with carbon. Metal X can be used in powder form in thermite welding whereas metal Y is used in making cathodes of ordinary dry cells.
(a) Name the metals X and Y.
(b) Which of the two metals is more reactive : X or Y?
(c) Name one ore or metal X. Also write its chemical formula.
(d) Name one ore or metal Y. Also write its chemical formula.
(e) Name one alloy of metal X and one alloy of metal Y.
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Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
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_______ is an alloy made from iron, carbon and chromium.
Find the odd one out and give its explanation.
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| 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 |
Draw a neat labelled diagram.
Anodizing
Complete flow chart given below.
Identify the correct statement from the following:
A man painted his main gate made up of iron, to
- prevent it from rusting.
- protect it from sun.
- make it look beautiful.
- make it dust free.
Which of the above statement(s) is/are correct?
Gold plated ornaments is the example of ______.
Explain the chemical reactions in rusting of iron.
