Advertisements
Advertisements
प्रश्न
Give two examples of alloys with their chemical composition.
Advertisements
उत्तर
Examples:
| Name of the alloy | Composition |
| Duralumin | Al + Cu + Mg + Mn |
| Brass | Cu + Zn |
APPEARS IN
संबंधित प्रश्न
Tinning : Tin : : Galvanizing : _________
Why do we apply paint on iron articles?
Give reasons:
Platinum, gold and silver are used to make jewellery.
The chemical reaction involved in the corrosion of iron metal is that of ______.
Why is an iron grill painted frequently?
Name five methods of preventing rusting of iron.
What are the special properties of stainless steel?
In stainless steel alloy, iron metal is mixed with ______.
If copper is kept exposed to damp air for a considerable time, it gets a green coating on its surface. This is due to the formation of ______.
Brass is an alloy of ______.
Explain with reason:
Roasting is carried out on sulphide ores and not on carbonate ores.
Write a short note on Alloying.
_______ forms a green colour in the water.
Write a molecular formula for rust.
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?
Observe the following diagram and write answers.
- Name the method.
- Explain the method.
- Give two examples of this method.
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.
State whether the following statement is true or false:
Ships suffer a lot of damage though they are painted.
Explain the following:
Lime water turns milky on passing carbon dioxide gas into it.
