Advertisements
Advertisements
प्रश्न
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Advertisements
उत्तर
In the electrolytic reduction of alumina, the reaction at the cathode is as follows:
Al3+ + 3e- → Al
APPEARS IN
संबंधित प्रश्न
Give two uses of bronze.
Name one metal which is extracted by:
Reduction with carbon.
Name one metal which is extracted by:
Reduction with heat alone.
How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
An important ore of zinc metal is ______.
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
- What are A and B?
- Identify C and D.
- What will be the action of C on litmus solution? Why?
- State whether element B is a solid, liquid or gas at room temperature.
- Write formula of the compound formed when element B reacts with an element E having atomic number 5.
State three objectives achieved during the roasting of ores.
Give the principles of electromagnetic separation.
Compare the process of calcination and roasting.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Which one of the following is not true of metal :
Metals are malleable and ductile
What is the difference between calcination and roasting?
Gold and silver are active metals.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
