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प्रश्न
Complete the following by selecting the correct option from the choices given :
The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction ________
विकल्प
Fe
Mg
Pb
Al
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उत्तर
The metal whose oxide, which is amphoteric, is reduced to metal by carbon reduction Pb.
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संबंधित प्रश्न
Explain with reason:
In the electrolytic reduction of alumina, the graphite anode is gradually consumed.
Write a balanced chemical equation for each of the following reactions :
(i) Reduction of copper (II) oxide by hydrogen
Name a non-metallic element which is a conductor of electricity.
Write balanced equation for the following reaction:
Reduction of iron (III) oxide by carbon monoxide.
If fused metallic chloride is electrolyzed, at which electrode would the metal be obtained?
What metallic property is shown by the non-metal graphite?
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(a) When bauxite is treated with sodium hydroxide solution, what happens to:
(i) the aluminium oxide?
(ii) The iron (III) oxide?
Answer the following question :
Name the process used for the enrichment of sulphide ore.
Write the observation for the following:
A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas.
- A to F below relate to the source and extraction of either zinc or aluminium:
- Bauxite
- Coke
- Cryolite
- Froth floatation
- Sodium hydroxide solution
- Zinc blende
- Write down the three letters each from the above list which are relevant to
- Zinc
- Aluminium
- Fill in the blanks using the most appropriate words from A to F.
- The ore from which aluminium is extracted must first be treated with ………………. so that pure aluminium oxide can be obtained.
- Pure aluminium oxide is dissolved in ….. to make a conducting solution.
iii. Write the formula of cryolite.
