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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
Name the following:
Main ore of aluminium.
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Give reasons.
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Why does a new aluminium vessel lose shine so soon after use?
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
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(a) iron
(b) aluminium
(c) mercury
(d) magnesium
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
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Cryolite
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Name the following:
The process of heating an ore to a high temperature in the presence of air.
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Metals are malleable and ductile
Froth floatation process is generally used to concentrate ______ ores.
In electrolytic reduction of alumina _______ is used as a cathode.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Identify who I am!
Ore of Aluminum- ______
