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प्रश्न
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
उत्तर
(b) manganese
Manganese is extracted from its oxide ore, pyrolusite. The name of the compound in the ore is manganese dioxide having chemical formula MnO2.
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संबंधित प्रश्न
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
What is meant by concentration of ores?
What is meant by refining of metals? Name the three common methods used for refining.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
What is the difference between calcination and roasting?
Name the process used for the enrichment of sulphide ore.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
