Advertisements
Advertisements
प्रश्न
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Advertisements
उत्तर
At anode: \[\ce{2O^{2-} -> O2 + 4e-}\]
APPEARS IN
संबंधित प्रश्न
Name two metals which are found in nature in the free state.
What chemical process is used for obtaining a metal from its oxide?
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Give two uses of bronze.
Name one metal which is extracted by reduction with heat alone.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Name the metal which is extracted from the ore called 'rock salt'.
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Give reasons, why aluminum is used in:
wrapping chocolates
Aluminum is used in thermite welding:
write reaction for process?
Give the chemical formula of :
Sodium aluminate
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Name : The metal which is liquid at room temperature.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Define calcination.
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.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
