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प्रश्न
Identify who I am!
Ore of Aluminum- ______
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उत्तर
Ore of Aluminum- Bauxite
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Give two uses of bronze.
Why does a new aluminium vessel lose shine so soon after use?
Why do gold ornaments look new even after several years of use?
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 |
Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
What is meant by concentration of ores?
What is galvanized iron.
Write equations for each of the above metal which reacts with water.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Usually ______ ores are subjected to ______ which is done in the absence of air.
What is the difference between calcination and roasting?
Name the process used for the enrichment of sulphide ore.
In electrolytic reduction of alumina _______ is used as a cathode.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
