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प्रश्न
An element E exists in three allotropic forms A, B and C. In allotrope A, the atoms of element E are joined to form spherical molecules. In allotrope B, each atom of element E is surrounded by three other E atoms to form a sheet like structure. In allotrope C, each atom of element E is surrounded by four other E atoms to form a rigid structure.
(a) Name the element E.
(b) What is allotrope A.
(c) What is allotrope B?
(d) What is allotrope C?
(e) Which allotrope is used in making jewellery?
(f) Which allotrope is used in making anode of a dry cell?
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उत्तर
(a) Carbon is the element 'E' which exists in three allotropic forms A, B and C.
(b) Buckminsterfullerene is the allotrope, A, of carbon in which the atoms are joined to form spherical molecules.
(c) Graphite is the allotrope, B, of carbon which is surrounded by three other carbon atoms to form a sheet like structure.
(d) Diamond is the allotrope, C, of carbon in which each atom is surrounded by four other carbon atoms to form a rigid structure.
(e) The allotrope C (Diamond) is used to make jewellery.
(f) The allotrope B (Graphite) is used in making anode of a dry cell.
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संबंधित प्रश्न
Elements forming ionic compounds attain noble gas configuration by either gaining or losing electrons from their outermost shells. Give reason to explain why carbon cannot attain noble gas configuration in this manner to form its compounds.
Name the type of bonds formed in ionic compounds and in the compounds formed by carbon.
What would be the electron dot structure of a molecule of sulphur which is made up of eight atoms of sulphur? (Hint – the eight atoms of sulphur are joined together in the form of a ring.)
What type of chemical bond is formed between carbon and bromine?
What type of bonds are present in hydrogen chloride and oxygen?
What type of bond exist in CCl4?
What is buckminsterfullerene?
How buckminsterfullerene is it related to diamond and graphite?
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
(a) fifty
(b) sixty
(c) seventy
(d) ninety
What do you understand by polar covalent compounds?
Explain the following:
polar covalent compounds electricity.
Explain the following term with example.
Hetero atom in a carbon compound
Write answer as directed.
What causes the existance of very large number of carbon compound ?
The carbon compound is used in daily life is ______.
Name a neutral covalent molecule which contains one lone pair of electrons.
An element L consists of molecules.
Why L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?
What do you understand by dipole (polar) molecule?
Give an example of the covalent bond formed by
(i) Similar atoms (ii) Dissimilar atoms
Name two carbon compounds used in day-to-day life.
When ethyl alcohol and acetic acid are mixed, the resulting ester has a chemical formula ______.
