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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
Name the following:
Main ore of aluminium.
Define the terms gangue.
Name two metals which are found in nature mainly in the free state (as metallic elements).
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Zinc blende ore can be converted into zinc oxide by the process of:
(a) roasting
(b) hydrogenation
(c) chlorination
(d) calcination
Which metal can be extracted from the following ore?
bauxite
Aluminum is used in thermite welding:
what is thermit?
What is meant by refining of metals? Name the three common methods used for refining.
Which method of refining is used to get 99.8% pure aluminium?
How many valence electrons are present in metals ?
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Zinc blende is converted to oxide by ______ process.
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.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
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 a reason why Aluminium is preferably used in thermite reactions.
