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प्रश्न
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?
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उत्तर
a) The atomic number of this element is 20.
b) The group of this element 2.
c) This element belongs to fourth period.
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संबंधित प्रश्न
Name the following:
Main ore of aluminium.
Give a reasons for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Why does a new aluminium vessel lose shine so soon after use?
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
What is meant by the ‘concentration of ore’?
Name two metals which are found in nature mainly in the free state (as metallic elements).
Which metal is extracted from cinnabar ore?
Which metal is extracted from calamine ore?
Zinc blende ore can be converted into zinc oxide by the process of ______.
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
- Which carbon electrode (cathode or anode) is burnt away?
- Why is this carbon electrode burnt away?
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the following:
Two metals which are found in the free or native state.
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain concept with example/explain with the help of a balanced equation.
Roasting
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
