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
What is an alloy?
Explain the term corrosion.
What are alloys?
What is meant by galvanisation? Why is it done?
______ and ______ are necessary for the rusting of iron.
Give the constituents of brass.
In stainless steel alloy, iron metal is mixed with ______.
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.
- Name the metals X and Y.
- Which of the two metals is more reactive: X or Y?
- Name one ore or metal X. Also write its chemical formula.
- Name one ore of metal Y. Also write its chemical formula.
- Name one alloy of metal X and one alloy of metal Y.
Name the metal which is a constituent of plant pigment?
Corrosion can be an advantage in some case.Explain ?
Complete the process of iron rusting by filling the blanks. Suggest a way to prohibit the process.
The iron rust is formed due to........................... reaction. Different
regions on iron surface become anode and cathode.
Reaction on anode region :
`F_e(s) → Fe^(2+) (aq) +2e^-`
Reaction on anode region :
`O_2(g) + 4H^+(aq) +............................ → 2H_2 O (l) `
When Fe2+ ions migrate from anode region they react with ................... to form Fe3+ ions.
A reddish coloured hydrated oxide is formed from ............... ions. It is called rust.
`2Fe_(3+) (aq) + 4H_2O(l) → ................. + 6H_+(aq) `
A way to prevent rusting ..................................................................
Identify the process shown in the diagram and explain it in short

Give reason.
A wooden article should be polished.
Write the name.
Method used to present corrosion of copper.
Write scientific reason.
Coins are made from metals and alloys.
Complete flow chart given below.

Give solutions by giving examples of corrosion?
Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of ____________.
Marble’s popularity began in ancient Rome and Greece, where white and off-white marble were used to construct a variety of structures, from hand-held sculptures to massive pillars and buildings.

The substance not likely to contain CaCO3 is:
Explain the following:
Bubbles are produced when acetic acid is added to a solution of sodium hydrogencarbonate.
