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प्रश्न
Write the name.
Metals which are amphoteric in nature.
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उत्तर
Metals which are amphoteric in nature- Aluminium (Al), zinc (Zn)
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संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Write the composition of the alloy called bronze.
Name two metals which are highly resistant to corrosion.
Name the gas produced when calamine ore is calcined.
How is copper extracted from its sulphide ore (copper glance), Cu2S? Explain with equations of the reactions involved.
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
Define the following term.
Mineral
Give the chemical formula of :
Cryolite
Define the term:
Flux
What is passive iron?
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Name the methods by which concentrated ore is converted to metallic oxide.
Zinc blende is converted to oxide by ______ process.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Extraction of moderately reactive elements is done by _______ and _______ method.
Explain in brief types of extraction of less reactive metals according to their reactivity.
A mineral from which the metal can be extracted economically and conveniently is known as ______.
