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प्रश्न
Extraction of moderately reactive elements is done by _______ and _______ method.
विकल्प
roasting and calcination
roasting and reduction
separation and calcination
none of these
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उत्तर
Extraction of moderately reactive elements is done by roasting and calcination method.
संबंधित प्रश्न
Which of the following pairs will give displacement reactions?
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 |
What is the difference between a mineral and an ore?
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
The metal which is always present in an amalgam is ______.
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.
- What are A and B?
- Identify C and D.
- What will be the action of C on litmus solution? Why?
- State whether element B is a solid, liquid or gas at room temperature.
- Write formula of the compound formed when element B reacts with an element E having atomic number 5.
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
Define the term:
Flux
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Define calcination.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Mercury, silver, gold are highly reactive metals.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain Bayer’s process.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain in brief types of extraction of less reactive metals according to their reactivity.
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
Electrical wires have a coating of an insulting material. The material, generally used is
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?
