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प्रश्न
What is an alloy? Give three reasons why alloys are made.
उत्तर
An alloy is a homogeneous mixture of two or more metals fused together and then solidified.
Alloys are made because they have many salient features:
- Tensile strength.
- Strength.
- Electrical hardness.
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संबंधित प्रश्न
Name an ore of zinc.
What is the role of cryolite `(Na_3AIF_6)` in the electrolytic reduction of alumina in Hall’s process?
State on what special properties the use of each of these metals depends:
zinc
State the use of:
Mild steel,
Name the following:
Two metals which occur in nature in free state as well as in combined state.
Name one metal occurring as a : Sulphide ore
Name an alloy of zinc which is used in simple voltaic cells.
Write the equation for the reaction of zinc with following: Dilute sulphuric acid
| X | Y | |
| Normal Electronic Configuration | 2, 8, 7 | 2, 8, 2 |
| Nature of Oxide | Dissolves in water and truns blue litmus red. | Very low solubility in water. Dissolves in hydrochloric acid. |
| Tendency for Oxidising and reducing reactions | Tends to oxidise elements and compound. | Tends to act as a reducing agent. |
| Electrical and Thermal Conductivity | Very poor electrical conductor. Poor thermal conductivity. |
Good electrical conductor. Good thermal conductor. |
| Tendency to form Alloys and Amalgams | No tendency to form alloys. | Forms alloys. |
Using the information above, complete the following:
- _________ is the metallic element.
- Metal atoms tend to have a maximum of ________ electrons in the outermost energy level.
- Non-metallic elements tend to form _________ oxides while metals tend to form _______ oxides.
- Non-metallic elements tend to be ______ conductors of heat and electricity.
- Metals tend to _______ electrons and act as ________ agents in their reactions with elements and compounds.
Name the following :
The process of coating of iron with zinc.
