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प्रश्न
Explain in brief types of extraction of highly reactive metals according to their reactivity.
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उत्तर
Extraction of highly reactive metals:
- Highly reactive metals such as sodium, magnesium and calcium are obtained by electrolytic reduction.
- The metals are deposited at the cathode (negatively charged electrode), whereas chlorine gas is liberated at the anode (positively charged electrode).
E.g. For extraction of sodium metal, cathode and anode reactions are as follows:
At cathode: \[\ce{Na+ + e^- -> Na}\] (Reduction)
At anode: \[\ce{2Cl- -> Cl2 + 2e^-}\] (Oxidation)
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संबंधित प्रश्न
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
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Explain giving equation, what happens when:
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Bauxite
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What is the function of cryolite used along with alumina as the electrolyte?
Explain the following:
Galvanization protects iron from rusting.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Name the methods by which concentrated ore is converted to metallic oxide.
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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.
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Sodium aluminate reacts with water
Complete flow chart given below.
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In extraction of copper, the flux used is ____________.
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