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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

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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 4.1

संबंधित प्रश्‍न

Name the following:

Main ore of aluminium.


In the extraction of aluminium: Name the process of concentration of bauxite.


What chemical process is used for obtaining a metal from its oxide?


In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.


Fill in the following blank with suitable word:

Bronze is an alloy of copper and .........


Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.


Which metal is extracted from cinnabar ore?


The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg


Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc


Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process : 
Why is powdered coke sprinkled on top of the electrolyte? 


Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.


Name the following:

The process of heating an ore to a high temperature in the presence of air.


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


Froth floatation process is generally used to concentrate ______ ores.


Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.


_______ is the least reactive metal.


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


Iqbal treated a lustrous, divalent element M with sodium hydroxide. He observed the formation of bubbles in reaction mixture. He made the same observations when this element was treated with hydrochloric acid. Suggest how can he identify the produced gas. Write chemical equations for both the reactions.


Give the reaction involved during extraction of zinc from its ore by

  1. roasting of zinc ore
  2. 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?


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