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प्रश्न
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
विकल्प
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
Name two metals which are highly resistant to corrosion.
Name one metal which is extracted by:
Reduction with heat alone.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Describe the extraction of zinc metal from its sulphide ore (zinc blende). Write equations of the reactions involved.
The metal which can be extracted from the bauxite ore is ______.
Give the principles of the hydrolytic method.
Aluminum is used in thermite welding:
write reaction for process?
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
How are metals refined by the electrolytic methods?
How many valence electrons are present in metals ?
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain Bayer’s process.
Explain the reactions of nonmetals with water with the help of examples.
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 following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
