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प्रश्न
Write the name.
The molecular formula of main ore of aluminium -
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उत्तर
Al2O3 · nH2O
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संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Write the composition of the alloy called bronze.
Name one metal which is extracted by:
Reduction with carbon.
An ore of manganese metal is ______.
Which of the following is an iron ore?
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
- What are A and B?
- Identify C and D.
- What will be the action of C on litmus solution? Why?
- State whether element B is a solid, liquid or gas at room temperature.
- Write formula of the compound formed when element B reacts with an element E having atomic number 5.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
In aluminiothermy
Aluminum is used in thermite welding:
write reaction for process?
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.
Define the following term.
Gangue
In electrolytic reduction of alumina _______ is used as a cathode.
Iron is _______.
Write the name.
Extraction of aluminium from alumina-
Mercury, silver, gold are highly reactive metals.
Care must be taken while diluting concentrated nitric acid with water. Why?
