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Explain concept with example/explain with the help of a balanced equation. Calcination - Science and Technology 1

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प्रश्न

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

Calcination

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उत्तर

  1. The process of heating carbonate ores in limited air to convert it into respective oxide is called calcination.
  2. For example, zinc carbonate is heated strongly in a limited supply of air to convert it to zinc oxide.
    \[\ce{\underset{\text{Zinc carbonate}}{ZnCO_{3(s)}} ->[Heat] \underset{\text{Zinc oxide}}{ZnO_{(s)}} + \underset{\text{Carbon dioxide}}{CO_2\uparrow}}\]
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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 1 [English] 10 Standard SSC
अध्याय 8 Metallugy
Explain concept with example/explain with the help of balanced equation | Q 4.2

संबंधित प्रश्न

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


Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.


How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.


Give the principles of electromagnetic separation.


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


What is passive iron?


The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.


Name:
The allotrope of the non-metal carbon which conducts electricity.


Define roasting.


Usually ______ ores are subjected to ______ which is done in the absence of air.


Zinc blende is converted to oxide by ______ process.


Observe the given figure of reactivity series of metals and answer the following questions:


                    Reactivity series of metals

  1. Name two metals which react with water.
  2. Name two moderately reactive metals.
  3. Name the most highly reactive metal and the most less reactive metal.

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


Zinc sulphide : Roasting : : zinc carbonate : _______


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?

Explain in brief electrolytic reduction of alumina with a neat labelled diagram.


Observe the figure and answer the following.

  1. Write the name of the method.
  2. What is used as anode and cathode in this method?
  3. Write the molecular formula and use of cryolite.
  4. Write anode reaction.
  5. Write cathode reaction.

In extraction of copper, the flux used is ____________.


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 the reason why the above reaction is known as a thermite reaction.


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