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प्रश्न
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
उत्तर १
In the electrolytic refining of a metal M:
- Anode: A thick slab of crude metal M.
- Cathode: A thin sheet of pure metal M.
- Electrolyte: Solution of a stable salt of the metal M.
उत्तर २
In electrolytic refining of metal, the electrolytic refining tank consists of:
- Anode: A bulky piece of impure metal (attached to a positive terminal)
- Cathode: A thin layer of pure metal (attached to the negative terminal)
- Electrolyte: The salt solution of the metal being refined is taken as the electrolytic solution or electrolyte.
When electricity is passed through the cell, impure metal from the anode melts and goes into the electrolyte. The pure metal from the electrolyte moves to the cathode and gets deposited there as pure metal. The impurities that are soluble dissolve in electrolyte and insoluble impurities deposit under anode as anode mud.
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संबंधित प्रश्न
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?
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name one metal which is extracted by electrolytic reduction.
Define the term ore.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
Which metal can be extracted from the following ore?
Calamine
Give reasons, why aluminum is used in:
making alloys
What is meant by concentration of ores?
Compare the process of calcination and roasting.
Answer the following question :
What is the difference between calcination and roasting.
Write the name.
Metals which are amphoteric in nature.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
