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प्रश्न
Give the principles of electromagnetic separation.
उत्तर
Magnetic properties of the ores.
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संबंधित प्रश्न
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Aluminium oxide is _______ oxide.
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?
Read the following passage and answer the questions.
According to the reactivity series, zinc is more reactive than iron, iron is more reactive than silver. During study of this, a student dipped the iron nails in silver nitrate solution.
- What is reactivity series?
- What will happen when iron nails are dipped in silver nitrate solution?
- Which type of reaction happens when iron metal reacts with silver nitrate solution?
- What will happen if a zinc rod is used instead of iron nail?
Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?
Electrical wires have a coating of an insulting material. The material, generally used is
