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प्रश्न
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?
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उत्तर
- The minerals from which the metal can be separated economically are called ores.
- The extraction of metals from their ores by various methods of separation and further purification to obtain pure metals are involved in the branch of metallurgy.
The extraction of metals from their ores and then refining them for use is known as metallurgy. - Metals such as silver, gold and platinum are found in free state.
- Metals are found in combined states as their salts such as oxides, carbonates, sulphides, and nitrates.
- The unwanted impurities of soil, sand, rocky substances, etc., present in the ore are called gangue.
संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Give two uses of bronze.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
Define the term ore.
Define the terms gangue.
What iron compound is present in haematite ore? Also write its chemical formula.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Name the anode, the cathode and the electrolyte used in the electrolytic refining of impure copper.
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
Name the following:
Two metals which are found in the free or native state.
Name the following:
A steel grey coloured solid non-metal.
Name the methods by which concentrated ore is converted to metallic oxide.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
In extraction of copper, the flux used is ____________.
Which of the following ore is concentrated by the Froth floatation process?
