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प्रश्न
Extraction of moderately reactive elements is done by _______ and _______ method.
विकल्प
roasting and calcination
roasting and reduction
separation and calcination
none of these
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उत्तर
Extraction of moderately reactive elements is done by roasting and calcination method.
संबंधित प्रश्न
Define the Ore.
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Name one metal which is extracted by:
Reduction with heat alone.
How is zinc extracted from its carbonate ore (calamine)? Explain with equations.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Which of the following pair of metals exists in their native state in nature?
The metal which is always present in an amalgam is ______.
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
Zinc blende ore can be converted into zinc oxide by the process of ______.
Which metal can be extracted from the following ore?
bauxite
Give reasons, why aluminum is used in:
In aluminiothermy
Aluminum is used in thermite welding:
what is ignition mixture?
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Aluminium oxide is _______ oxide.
Find the odd one out and give its explanation.
Gold and silver are active metals.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
