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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

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


M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:

1) What kind of combination exists between M and O?

2)How many electrons are there in the outermost shell of M?

3) Name the group to which M belongs.

4) State the reaction taking place at the cathode.

5) Name the product at the anode.


Name two metals which are highly resistant to corrosion.


Name one metal which is extracted by reduction with aluminium.


Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.


Define the term mineral.


Name two metals which are found in nature mainly in the free state (as metallic elements).


Which metal is extracted from cinnabar ore?


Name the metal which is extracted from haematite ore.


Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.


Which metal can be extracted from the following ore?

Haematite


Define the following term.

Mineral


Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________


State three objectives achieved during the roasting of ores.


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


Zinc blende is converted to oxide by ______ process.


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.


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


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.


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