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प्रश्न
Explain concept with example/explain with the help of a balanced equation.
Calcination
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उत्तर
- The process of heating carbonate ores in limited air to convert it into respective oxide is called calcination.
- 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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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Which metal is extracted from bauxite ore?
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Zinc blende ore can be converted into zinc oxide by the process of ______.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Aluminum is used in thermite welding:
what is thermit?
Identify the process given in following passage and draw neat labelled diagram showing the process.
Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.
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?
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Answer the following question :
What is the difference between calcination and roasting.
Right or wrong sentence?
The electrolysis of alumina combines fluorite and cryolite to increase the solubility in the precipitation method.
Identify who I am!
Ore of Aluminum- ______
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
