Advertisements
Advertisements
प्रश्न
A to F below relate to the source and extraction of either zinc or aluminium.
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
Write the formula of cryolite.
उत्तर
\[\ce{Na3AlF6}\]
APPEARS IN
संबंधित प्रश्न
Name the most common ore of the metal aluminium from which the metal is extracted. Write the chemical formula of the ore.
Explain the following:
Zinc is used to cover iron so as to prevent rusting of iron. Why?
State the use of:
cast iron
Name an alloy of lead used in electrical wiring or electrical work in joining metals.
Name an alloy of zinc used in naval ships.
Explain the following:
Aluminium is extensively used for making aircraft parts.
Name a metal which occurs free in nature.
Answer the following question :
Write the constituents of electrolyte for the extraction of aluminum.
| 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.
choose the most appropriate term to match the given description.
Crushing of the ore into a fine powder
