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प्रश्न
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
उत्तर
(d) aluminium
There are some metals that cannot be satisfactorily reduced by carbon. In such cases, aluminium is used as reducing agent, e.g., manganese.
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संबंधित प्रश्न
Name the following: Main ore of aluminium.
Define the Ore.
Name two metals which are found in nature in the free state.
Which of the following pairs will give displacement reactions?
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Name three other metals which are extracted in a manner similar to sodium.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
(a) Name the metal X.
(b) Name the metal oxide XO2.
(c) Which reducing agent can be used to reduce XO2 to obtain metal X?
(d) Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
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.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
