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प्रश्न
Aluminium powder is used in thermite welding because
विकल्प
It is a strong reducing agent
It is a strong oxidizing agent
It is corrosion resistant
It is a good conductor of heat
उत्तर
It is a strong reducing agent
APPEARS IN
संबंधित प्रश्न
Select the process from the following which matches the given description.
(calcination, roasting, pulverisation, smelting)
Crushing of the ore into a fine powder.
Give the name and formula of the main orea of iron and zinc ?
Name an ore which is concentrated by:
magnetic separation
State a reason why zinc is used in:
dry cells
State amalgam use with an example.
Find the odd one out of the following and explain your choice.
Sulphur, Phosphorous, Carbon, Iodine
| 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.
State the main components of the following alloy:
Duralumin
Bauxite : Aluminium ore : : Cassiterite : _______
The common method of the extraction of metal from the oxide ore is:-
