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प्रश्न
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
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उत्तर
In the electrolytic reduction of alumina, the reaction at the cathode is as follows:
Al3+ + 3e- → Al
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संबंधित प्रश्न
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name two metals which occur in nature in free state as well as in combined state.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
The two metals which can be extracted just by heating their sulphides in air are ______.
Which of the following metals can be obtained from haematite ore?
Manganese metal is extracted from manganese dioxide by a reduction process by making use of ______.
Zinc blende ore can be converted into zinc oxide by the process of ______.
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.
Give reasons, why aluminum is used in:
making alloys
Aluminum is used in thermite welding:
what is thermit?
Aluminum is used in thermite welding:
what is ignition mixture?
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Define the term:
Flux
Name:
The allotrope of the non-metal carbon which conducts electricity.
Explain Bayer’s process.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
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.
