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प्रश्न
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
उत्तर
Cryolite
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संबंधित प्रश्न
Name the chemical compound which is electrolysed in molten state to obtain sodium metal. Which gas is produced in this process?
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
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
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
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.
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
