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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
Name the following:
Main ore of aluminium.
Define the Ore.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Name two metals which are always found in combined state.
What iron compound is present in haematite ore? Also write its chemical formula.
Which metal is extracted from bauxite ore?
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.
Give reasons, why aluminum is used in:
wrapping chocolates
Name the following:
Two metals which are found in the free or native state.
How are metals refined by the electrolytic methods?
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Name the following:
A steel grey coloured solid non-metal.
Define roasting.
Zinc sulphide : Roasting : : zinc carbonate : _______
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
The poorest conductor of heat among metals is ____________.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
