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प्रश्न
Write the name.
The process of extraction of aluminium from alumina-
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उत्तर
The process of extraction of aluminium from alumina- Electrolytic reduction
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संबंधित प्रश्न
Name one metal which is extracted by:
Reduction with heat alone.
Bronze is an alloy of copper and ______.
Name the method by which aluminium metal is extracted.
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
- What is metal А?
- What is metal C?
- Name the substance B.
- Name the substance D.
- What type of chemical can be used to remove the green layer from metal C and clean it? Why?
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.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Which metal can be extracted from the following ore?
Haematite
Define the following term.
Gangue
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
How are metals refined by the electrolytic methods?
What is passive iron?
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Explain the concept of Calcination.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Which of the following ore is concentrated by the Froth floatation process?
Care must be taken while diluting concentrated nitric acid with water. Why?
