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प्रश्न
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
पर्याय
Right
Wrong
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उत्तर
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point- Wrong
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संबंधित प्रश्न
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.
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Give the chemical formula of :
Cryolite
Name the following:
Two metals which are found in the free or native state.
How are metals refined by the electrolytic methods?
What is passive iron?
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Name the methods by which concentrated ore is converted to metallic oxide.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Sulphide ores : Roasting : : Carbonate ores : _______
Write the name.
The process of extraction of aluminium from alumina-
Write the molecular formulae of the following compound.
Cryolite
Explain Bayer’s process.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
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?
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
