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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
Name the following:
Main ore of aluminium.
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name three other metals which are extracted in a manner similar to sodium.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Which metal can be extracted from the following ore?
Haematite
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
What is galvanized iron.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Usually ______ ores are subjected to ______ which is done in the absence of air.
Froth floatation process is generally used to concentrate ______ ores.
What is the difference between calcination and roasting?
_______ is the least reactive metal.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain the concept of Roasting.
Explain the reactions of nonmetals with water with the help of examples.
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
