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प्रश्न
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Why is powdered coke sprinkled on top of the electrolyte?
उत्तर
Coke while burning takes up oxygen from Al2 O3 (bauxite) and is converted into Co and also into CO2 .
- The CO produced also reduces Al2 O3 . This reduction process helps in purification of aluminium.
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संबंधित प्रश्न
Name the most abundant metal in the earth's crust.
Name two metals which occur in nature in free state as well as in combined state.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
Name the following:
Name two metals always find in combined state.
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
In electrolytic reduction of alumina _______ is used as a cathode.
Write the molecular formulae of the following compound.
Fluorspar
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
