Advertisements
Advertisements
प्रश्न
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Advertisements
उत्तर
The anode is replaced from time to time because it gets oxidised by oxygen which evolves at it.
APPEARS IN
संबंधित प्रश्न
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
What is the difference between a mineral and an ore?
Name three other metals which are extracted in a manner similar to sodium.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
Which metal can be extracted from the following ore?
bauxite
Aluminum is used in thermite welding:
write reaction for process?
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.
How are metals refined by the electrolytic methods?
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Define roasting.
Froth floatation process is generally used to concentrate ______ ores.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Atomic number of aluminium is _______ and its electronic configuration is _______.
_______ is the least reactive metal.
Right or wrong sentence?
In the electrolytic dissipation method of alumina, the lining of graphite acts as an anode.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
