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प्रश्न
Find the odd one out and give its explanation.
पर्याय
Zinc coating
Tinning
Electroplating
Calcination
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उत्तर
Calcination
Explanation-
Calcination is a process involved in extraction of carbonate ores while others are methods used for prevention of corrosion.
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संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
Which of the following pairs will give displacement reactions?
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
What is meant by the 'concentration of ore'?
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
The major ore of aluminium is known as:
(a) cinnabar
(b) calamine
(c) bauxite
(d) pyrolusite
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
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Define the term:
Slag
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
In electrolytic reduction of alumina _______ is used as a cathode.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
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?
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
