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प्रश्न
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
पर्याय
Right
Wrong
उत्तर
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point- Wrong
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संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Give the name and chemical formula of one ore of copper.
Explain given equation, what happens when ZnCO3 is heated in the absence of air?
How is aluminium metal extracted? Explain with the help of an equation.
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
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.
Give the principles of the froth floatation process.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Compare the process of calcination and roasting.
Explain the following:
Galvanization protects iron from rusting.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Which one of the following is not true of metal :
Metals are malleable and ductile
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 ______.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Find the odd one out and give its explanation.
Explain the reactions of nonmetals with water with the help of examples.
Explain the characteristics of ionic compounds.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
