Advertisements
Advertisements
प्रश्न
Define the Ore.
Define the following term.
Ore
उत्तर १
Minerals from which metals can be extracted profitably are known as ores.
उत्तर २
If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.
APPEARS IN
संबंधित प्रश्न
Name two metals which are found in nature in the free state.
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name the most abundant metal in the earth's crust.
Name the gas in air which tarnishes silver articles slowly.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
Name the following:
Two metals which are found in the free or native state.
Name the following:
The mixture of materials fed into a furnace to extract a metal.
How are metals refined by the electrolytic methods?
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
Metals which are amphoteric in nature.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain the characteristics of ionic compounds.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
A mineral from which the metal can be extracted economically and conveniently is known as ______.
