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प्रश्न
How do the properties of an alloy differ from alloy constituents?
उत्तर
- The properties of alloys are often greatly different from those of the components.
- For example, gold is too soft to be used without a small percentage of copper.
- A low percentage of molybdenum improves the toughness and wear resistance of steel.
- Bell metal is more sonorous than copper or tin.
- Alnico, an alloy of aluminium, nickel, and cobalt, can lift 60 times its mass.
- These added elements improve hardness, wear resistance, toughness and other properties.
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संबंधित प्रश्न
Select the process from the following which matches the given description.
(calcination, roasting, pulverisation, smelting)
Heating of the ore in the absence of air to a high temperature.
Choose the correct answer from the options given below:
The main ore used for the extraction of iron is
A. Haematite
B. Calamine
C. Bauxite
D. Cryolite
How does aluminum react with the Air ?
Why ‘the food containing iron salts’ should not be cooked in aluminium utensils?
Name an ore which is concentrated by:
forth floatation process
The following question refer to the extraction of aluminium and iron from their ores:
Iron and aluminum ores both, contain impurities. Explain briefly how these impurities are removed in each case.
List 1 contains the meta ls I alloys (1, 2, 3, 4, 5 ) and list 2 contains their uses (A, B, C, D, E).
| List 1 Metal/Alloy |
List 2 Uses |
| 1. Aluminium | A. Steel making |
| 2. Lead | B. aeroplane wings |
| 3. Brass | C. galvanizing |
| 4. Iron | D. radiation shield |
| 5. Zinc | E. electricaI fittings |
Copy and complete the following table, write down the correct letter against the numbers representing metals. An answer may be used only once. The first has been done for you.
| Metal | 1 | 2 | 3 | 4 | 5 |
| Use | B |
This is not an alloy of copper:
Metal sheets : Malleable : : Electric wires : _______
What is the role of flux in metallurgical processes?
