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प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
पर्याय
Right
Wrong
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उत्तर
In the electrolytic method, a layer of highly active metal is applied to a less active metal- Wrong
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संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Define the term ore.
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Define the following term.
Mineral
Define the following term.
Gangue
How an ore is concentrated by froth floatation process?
Compare the process of calcination and roasting.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
How many valence electrons are present in metals ?
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
Which one of the following is not true of metal :
Metals are malleable and ductile
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Zinc blende is converted to oxide by ______ process.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Write the molecular formulae of the following compound.
Cryolite
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?
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
