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प्रश्न
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
उत्तर
Metals are malleable while non-metals are non-malleable.
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संबंधित प्रश्न
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Give the name and chemical formula of one ore of copper.
What is meant by the 'concentration of ore'?
How is aluminium metal extracted? Explain with the help of an equation.
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Give the principles of electromagnetic separation.
Give the chemical formula of :
Bauxite
Bauxite reacts with sodium hydroxide in the Bayer’s process.
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?
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
