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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: Why is it necessary to replace anodes time to time?
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by reduction with aluminium.
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name the gas produced when calamine ore is calcined.
What iron compound is present in haematite ore? Also write its chemical formula.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
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 ______.
Name the methods by which concentrated ore is converted to metallic oxide.
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.
Mercury, silver, gold are highly reactive metals.
Write the molecular formulae of the following compound.
Sodium aluminate
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 in brief electrolytic reduction of alumina with a neat labelled diagram.
