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प्रश्न
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
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उत्तर
In the electrolytic reduction of alumina, the reaction at the cathode is as follows:
Al3+ + 3e- → Al
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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?
Which of the following pairs will give displacement reactions?
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
The process by which sulphide ore is concentrated.
Why do gold ornaments look new even after several years of use?
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as ______.
Iron is _______.
Aluminium oxide is _______ oxide.
Extraction of moderately reactive elements is done by _______ and _______ method.
Find the odd one out and give its explanation.
Write the name.
The molecular formula of main ore of aluminium –
Explain the concept of Roasting.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
