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प्रश्न
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.
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उत्तर
Electrolytic reduction of Alumina :
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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.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name the gas evolved when cinnabar ore is roasted.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
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.
Which metal can be extracted from the following ore?
bauxite
Name the following:
Two metals which are found in the free or native state.
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Write the name.
Metals which are amphoteric in nature.
Write the molecular formulae of the following compound.
Cryolite
Write the molecular formulae of the following compound.
Fluorspar
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
Oxides of moderately reactive metals like Zinc, Iron, Nickel, Tin, Copper, etc. are reduced by using:
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
- 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
