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प्रश्न
Explain the concept of Calcination.
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उत्तर
In the calcination process, carbonate ores are strongly heated in a limited supply of air to transform them into oxides. In this process, carbonate ores decompose to form a metal oxide and carbon dioxide gas.
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संबंधित प्रश्न
Give two uses of bronze.
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 |
Name the method by which aluminium metal is extracted.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Name the gas produced when calamine ore is calcined.
Name the electrode at which aluminium metal is produced.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
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.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Give the chemical formula of :
Sodium aluminate
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Froth floatation process is generally used to concentrate ______ ores.
In electrolytic reduction of alumina _______ is used as a cathode.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Aluminium oxide is _______ oxide.
Explain the characteristics of ionic compounds.
Explain concept with example/explain with the help of a balanced equation.
Calcination
Explain in brief types of extraction of less reactive metals according to their reactivity.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
