Advertisements
Advertisements
प्रश्न
In electrolytic reduction of alumina _______ is used as a cathode.
पर्याय
sulphur
graphite
platinum
aluminium
Advertisements
उत्तर
In electrolytic reduction of alumina graphite is used as a cathode.
APPEARS IN
संबंधित प्रश्न
Define the Ore.
What chemical process is used for obtaining a metal from its oxide?
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Give two uses of bronze.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Give the name and chemical formula of one ore of copper.
Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
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
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Define roasting.
Answer the following question:
Carbon cannot reduce the oxides of sodium, magnesium, and aluminum to their respective metals. Why? Where are these metals placed in the reactivity series? How are these metals obtained from their ores? Take an example to explain the process of extraction along with chemical equations.
Gold and silver are active metals.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
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.
An alloy is
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
