Advertisements
Advertisements
प्रश्न
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
विकल्प
Right
Wrong
Advertisements
उत्तर
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point- Wrong
APPEARS IN
संबंधित प्रश्न
Which of the following pairs will give displacement reactions?
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
Give reasons.
Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Name the following:
The property possessed by metals by which they can be beaten into sheets.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Which metal is extracted from calamine ore?
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Which metal can be extracted from the following ore?
Calamine
Give reasons, why aluminum is used in:
making alloys
Give reasons, why aluminum is used in:
In making ships
Name the following:
Two metals which are found in the free or native state.
What is meant by concentration of ores?
How are metals refined by the electrolytic methods?
Which method of refining is used to get 99.8% pure aluminium?
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Aluminium oxide is _______ oxide.
