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प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
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उत्तर
Extraction of aluminium:
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संबंधित प्रश्न
Write the composition of the alloy called bronze.
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by:
Reduction with carbon.
What is meant by the ‘concentration of ore’?
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Which of the following is an iron ore?
Rock salt is an ore of one of the following metals. This metal is:
Calamine ore can be converted into zinc oxide by the process of ______.
Aluminum is used in thermite welding:
write reaction for process?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Define roasting.
Write the molecular formulae of the following compound.
Fluorspar
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Answer the questions on the following passage.
The minerals from which the metal can be separated economically are called ores. Ores contain many types of impurities such as soil, sand and rocky substances along with metal compounds. These impurities are called gangue.
Metals can be extracted from their ores by means of various methods of separation. The process of extraction of metal in a pure state from the ores is also a part of metallurgy.
Ores are taken out from the mines and the gangue is usually separated from the ore at the site itself by various methods. Then the ores are carried out to the place where metals are produced. Here metals are extracted in pure form. Then metals are further purified by different methods of purification. This entire process is called metallurgy. Most metals being reactive do not occur in nature in the free state but are found in combined state as their salts such as oxides, carbonates, sulphides, and nitrates. however, the most unreactive metals that are not affected by air, water and other natural factors like silver, gold, platinum, generally occur in a free state. The compounds of metals that occur in nature along with the impurities are called minerals.
- What are ores?
- Which processes are involved in the branch of metallurgy? What is metallurgy?
- Which metals are found in a free state?
- In what forms are metals found in combined state?
- What is gangue?
An alloy is
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 a reason why Aluminium is preferably used in thermite reactions.
