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प्रश्न
Write the molecular formulae of the following compound.
Cryolite
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उत्तर
Cryolite- Na3AlF6
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Why do gold ornaments look new even after several years of use?
Name two metals which are highly resistant to corrosion.
Define the term mineral.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Name the metal which is extracted from the ore called ‘rock salt’.
The two metals which are extracted by means of electrolytic reduction of their molten salts are ______.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Aluminum is used in thermite welding:
what is ignition mixture?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Answer the following question :
What is the difference between calcination and roasting.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain concept with example/explain with the help of a balanced equation.
Calcination
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 the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
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.
