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प्रश्न
Write the name.
Metals which are amphoteric in nature.
उत्तर
Metals which are amphoteric in nature- Aluminium (Al), zinc (Zn)
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Which metal can be extracted from the following ore?
bauxite
Which metal can be extracted from the following ore?
Calamine
Give the principles of the froth floatation process.
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?
Name:
The allotrope of the non-metal carbon which conducts electricity.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
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 are malleable and ductile
Name the methods by which concentrated ore is converted to metallic oxide.
Find the odd one out and give its explanation.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
