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प्रश्न
Write the name.
The process of strong heating of carbonate ores in insufficient air–
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उत्तर
The process of strong heating of carbonate ores in insufficient air– Calcination
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संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Name two metals which occur in nature in free state as well as in combined state.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
What is the difference between a mineral and an ore?
Which metal is extracted from cinnabar ore?
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Rock salt is an ore of one of the following metals. This metal is:
(a) Mn
(b) Na
(c) Fe
(d) Cu
Give the principles of electromagnetic separation.
Aluminum is used in thermite welding:
what is thermit?
Define the term:
Slag
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Zinc blende is converted to oxide by ______ process.
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.
Iron is _______.
Extraction of moderately reactive elements is done by _______ and _______ method.
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
