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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
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Name two metals which occur in nature in free state as well as in combined state.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
State three objectives achieved during the roasting of ores.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Give reasons, why aluminum is used in:
In making ships
Which method of refining is used to get 99.8% pure aluminium?
What is passive iron?
Name:
The allotrope of the non-metal carbon which conducts electricity.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
What is the difference between calcination and roasting?
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Find the odd one out and give its explanation.
Complete flow chart given below.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
