Advertisements
Advertisements
प्रश्न
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Advertisements
उत्तर
In Electrolytic reduction of alumina, Anode : Set of carbon (graphite) rods : : Cathode : Graphite lining
APPEARS IN
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
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?
Give two uses of bronze.
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
Name one metal which is extracted by:
Electrolytic reduction.
Explain giving equation, what happens when:
A mixture of Cu2O and Cu2S is heated.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Which metal is extracted from calamine ore?
Which of the following reactants are used to carry out the thermite reaction required for welding the broken railway tracks?
Which of the following metals are extracted by the electrolysis of their molten chlorides?
Which metal can be extracted from the following ore?
Calamine
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Define the term:
Flux
How many valence electrons are present in non- metals?
_______ is the least reactive metal.
Find the odd one out and give its explanation.
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Electrical wires have a coating of an insulting material. The material, generally used is
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
