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प्रश्न
Write the name.
The process of strong heating of carbonate ores in insufficient air–
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उत्तर
The process of strong heating of carbonate ores in insufficient air– Calcination
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
Name two metals which are highly resistant to corrosion.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its:
(a) oxide
(b) hydride
(c) sulphide
(d) carbonate
Which metal can be extracted from the following ore?
Haematite
Aluminum is used in thermite welding:
write reaction for process?
Give the chemical formula of :
Sodium aluminate
What is galvanized iron.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Find the odd one out and give its explanation.
Mercury, silver, gold are highly reactive metals.
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Answer the questions on the following passage.
The minerals from which the metal can be separated economically are called ores. Ores contain many types of impurities such as soil, sand and rocky substances along with metal compounds. These impurities are called gangue.
Metals can be extracted from their ores by means of various methods of separation. The process of extraction of metal in a pure state from the ores is also a part of metallurgy.
Ores are taken out from the mines and the gangue is usually separated from the ore at the site itself by various methods. Then the ores are carried out to the place where metals are produced. Here metals are extracted in pure form. Then metals are further purified by different methods of purification. This entire process is called metallurgy. Most metals being reactive do not occur in nature in the free state but are found in combined state as their salts such as oxides, carbonates, sulphides, and nitrates. however, the most unreactive metals that are not affected by air, water and other natural factors like silver, gold, platinum, generally occur in a free state. The compounds of metals that occur in nature along with the impurities are called minerals.
- What are ores?
- Which processes are involved in the branch of metallurgy? What is metallurgy?
- Which metals are found in a free state?
- In what forms are metals found in combined state?
- What is gangue?
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
A mineral from which the metal can be extracted economically and conveniently is known as ______.
