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प्रश्न
Buckminsterfullerene is spherical molecule in which 60 carbon atoms are arranged in interlocking hexagonal and pentagonal rings of carbon atoms.
How many hexagons of carbon atoms are present in one molecule of buckminsterfullerene?
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उत्तर
In one molecule of buckminsterfullerene, 20 hexagons of carbon atoms are present.
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संबंधित प्रश्न
Write any three features and give two examples of covalent compounds
what substance is graphite made?
Why are covalent compounds generally poor conductors of electricity?
One of the following contains a double bond as well as single bonds. This is:
(a) CO2
(b) O2
(c) C2H4
(d) C2H2
Two non-metals combine with each other by the sharing of electrons to form a compound X.
(a) What type of chemical bond is present in X?
(b) State whether X will have a high melting point or low melting point.
(c) Will it be a good conductor of electricity or not?
(d) Will it dissolve in an organic solvent or not?
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?
Explain the following term with example.
Hetero atom in a carbon compound
Give examples for the following:
Two liquid non polar compounds.
Explain the following:
Covalent compounds are generally gases or liquids or soft solids.
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?
Element A has 2 electrons in its M shell. Element B has atomic number 7.
If B is a diatomic gas, write the equation for the direct combination of A and B to form a compound.
What is the difference between a polar covalent compound and a non-polar covalent compound?
From the following hydrocarbon _______ is the cyclic hydrocarbon.
Write the molecular formula of the given compound.
Acetic acid
Consider the coordination compound, K2[Cu(CN)4]. A coordinate covalent bond exists between:
`"CH"_3 - "CH"_2 - "OH" overset("Alkaline""KMnO"_4 + "Heat")(->) "CH"_3 - "COOH"`
In the above given reaction, alkaline KMnO4 acts as
Mineral acids are stronger acids than carboxylic acids because
- mineral acids are completely ionised
- carboxylic acids are completely ionised
- mineral acids are partially ionised
- carboxylic acids are partially ionised
State the reasons, why carbon cannot
- Lose four electrons to form C4+ cation and
- Gain four electrons to form C4- anion.
How does carbon overcome this problem to form compounds?
In covalent compounds, the bond is formed due to ______ of electrons.
