Advertisements
Advertisements
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.
Advertisements
उत्तर
Electrolytic reduction of Alumina :
APPEARS IN
संबंधित प्रश्न
Name the following:
Main ore of aluminium.
In the extraction of aluminium: Name the process of concentration of bauxite.
Name the most abundant metal in the earth’s crust.
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 |
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Explain giving equation, what happens when:
A mixture of Cu2O and Cu2S is heated.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Which of the following is an iron ore?
State three objectives achieved during the roasting of ores.
Give reasons, why aluminum is used in:
making alloys
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
How an ore is concentrated by froth floatation process?
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Iron is _______.
Zinc sulphide : Roasting : : zinc carbonate : _______
Gold and silver are active metals.
Write the molecular formulae of the following compound.
Fluorspar
Write the molecular formulae of the following compound.
Sodium aluminate
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
