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
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Explain giving equation, what happens when:
ZnCO3 is heated in the absence of air?
Name the gas evolved when cinnabar ore is roasted.
Name two metals which are always found in combined state.
Name the metal which is extracted from the ore called ‘rock salt’.
State three objectives achieved during the roasting of ores.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Which method of refining is used to get 99.8% pure aluminium?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Sulphide ores : Roasting : : Carbonate ores : _______
Mercury, silver, gold are highly reactive metals.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Identify who I am!
Ore of Aluminum- ______
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
