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प्रश्न
Sulphide ores : Roasting : : Carbonate ores : _______
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उत्तर
Sulphide ores : Roasting : : Carbonate ores : Calcination
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संबंधित प्रश्न
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Name the most abundant metal in the earth’s crust.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Name one metal which is extracted by:
Electrolytic reduction.
Name one metal which is extracted by:
Reduction with aluminium.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
The metal which can be extracted from the bauxite ore is ______.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of ______.
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.
- Which carbon electrode (cathode or anode) is burnt away?
- Why is this carbon electrode burnt away?
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
- What is metal А?
- What is metal C?
- Name the substance B.
- Name the substance D.
- What type of chemical can be used to remove the green layer from metal C and clean it? Why?
Name the process used for the enrichment of sulphide ore.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Zinc sulphide : Roasting : : zinc carbonate : _______
Explain the concept of Calcination.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain concept with example/explain with the help of a balanced equation.
Calcination
Complete flow chart given below.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
