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प्रश्न
Iron is _______.
पर्याय
more reactive than zinc
more reactive than aluminium
less reactive than copper
less reactive than aluminium
उत्तर
Iron is less reactive than aluminium.
APPEARS IN
संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
Explain why, an aqueous solution of sodium chloride is not used for the electrolytic extraction of sodium metal.
Name two metals which are always found in combined state.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Which metal is extracted from bauxite ore?
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
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Which metal can be extracted from the following ore?
bauxite
Define the following term.
Mineral
Name : The metal which is liquid at room temperature.
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Answer the following question :
What is the difference between calcination and roasting.
Define calcination.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
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?
