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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

Explain concept with example/explain with the help of a balanced equation. Roasting

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प्रश्न

Explain concept with example/explain with the help of a balanced equation.

Roasting

टीपा लिहा
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उत्तर

  1. The process of heating of sulphide ores strongly in excess of air to convert it into respective oxide is called roasting.
  2. For example, zinc sulphide is heated strongly in excess of air to convert it to zinc oxide.
    \[\ce{\underset{\text{Zinc sulphide}}{2ZnS_{(s)}} + 3O_{2(g)} -> \underset{\text{Zinc oxide}}{2ZnO_{(s)}} + \underset{\text{Sulphur dioxide}}{2SO_2↑}}\]
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पाठ 8: Metallugy - Explain concept with example/explain with the help of balanced equation [पृष्ठ ३१]

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
पाठ 8 Metallugy
Explain concept with example/explain with the help of balanced equation | Q 4 (i) | पृष्ठ ३१

संबंधित प्रश्‍न

In the electrolytic refining of a metal M, what would you take as anode, cathode and electrolyte?


In the extraction of aluminium: Draw the diagram for the extraction of aluminium.


Why do gold ornaments look new even after several years of use?


Name the gas evolved when cinnabar ore is roasted.


Rock salt is an ore of one of the following metals. This metal is:


When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.

  1. What is metal А?
  2. What is metal C?
  3. Name the substance B.
  4. Name the substance D.
  5. What type of chemical can be used to remove the green layer from metal C and clean it? Why?

Give the chemical formula of : 
 Sodium aluminate 


What is meant by refining of metals?


The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.


Name the following:

A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.


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


Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.


What is the difference between calcination and roasting?


Sulphide ores : Roasting : : Carbonate ores : _______


Explain concept with example/explain with the help of a balanced equation.

Ionic bond and ionic compounds


Explain in brief types of extraction of less reactive metals according to their reactivity.


Which of the statements about the reaction, \[\ce{ZnO + CO -> Zn + CO2}\] is correct?


Which of the following ore is concentrated by the Froth floatation process?


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