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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

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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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अध्याय 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
अध्याय 8 Metallugy
Explain concept with example/explain with the help of balanced equation | Q 4.1

संबंधित प्रश्न

Define the Ore.


How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.


Explain giving equation, what happens when:

ZnCO3 is heated in the absence of air?


In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.

  1. Which carbon electrode (cathode or anode) is burnt away?
  2. Why is this carbon electrode burnt away?

Aluminum is used in thermite welding:

write reaction for process?


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?


How many valence electrons are present in non- metals?


Zinc blende is converted to oxide by ______ process.


Iron is _______.


In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining


The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.


Write the molecular formulae of the following compound.

Sodium aluminate


Explain the following reaction with the balanced equation.

Ferric oxide is reacted with aluminium.


Explain the following reaction with the balanced equation.

Dry aluminium hydroxide is ignited at 1000 °C


Explain the following reaction with the balanced equation.

Zinc carbonate is heated strongly in limited supply of air


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.

  1. What is reactivity series?
  2. What will happen when iron nails are dipped in silver nitrate solution?
  3. Which type of reaction happens when iron metal reacts with silver nitrate solution?
  4. What will happen if a zinc rod is used instead of iron nail?

Which of the following metals exist in their native state in nature?

  1. Cu
  2. Au
  3. Zn
  4. Ag

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

  1. roasting of zinc ore
  2. calcination of zinc ore

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