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प्रश्न
Name one metal which is extracted by reduction with heat alone.
उत्तर
Reduction with heat alone: Mercury is a least reactive metal and thus, it is reduced on heating alone.
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संबंधित प्रश्न
Name the most abundant metal in the earth's crust.
What is the difference between a mineral and an ore?
Give reasons, why aluminum is used in:
making alloys
Name the following:
Two metals which are found in the free or native state.
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Name the following:
A steel grey coloured solid non-metal.
State three objectives achieved during the roasting of ores.
What is the difference between calcination and roasting?
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
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?
