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प्रश्न
Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?
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उत्तर
Graphite is a good conductor of electricity because of the presence of free electrons in its crystal. As we know that an atom of carbon has 4 valence electrons, in a graphite crystal, each carbon atom is connected to only three other carbon atoms by covalent bonds. This means that the fourth valence electron of each carbon atom is free. These free moving electrons are responsible for the conduction of electricity in a graphite crystal. But in the case of diamond these free electrons are not available due to its structure. Hence, diamond is a non-conductor.
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संबंधित प्रश्न
List three characteristic properties of covalent compounds.
State the reason why carbon can neither form C4+ cations nor C4− anions but forms covalent compounds.
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?
Name a carbon containing molecule which has two double bonds.
What type of bonds are present in Cl2 molecule? Draw their electron-dot structures.
Give two general properties of ionic compounds and two those of covalent compounds.
State one test by which sodium chloride can be distinguished from sugar.
will CS2 conduct electricity or not?
give reason for your choice.
Describe the structure of diamond. Draw a simple diagram to show the arrangement of carbon atoms in diamond.
what substance is graphite made?
Why are covalent compounds generally poor conductors of electricity?
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?
Draw all possible structural formulae of compound from their molecular formula given below.
C3H8
What do you understand by lone pair and shared pair?
Explain the following:
Non-polar covalent compounds are insoluble in water.
State the type of bonding in the following molecule.
Water
Element A has 2 electrons in its M shell. Element B has atomic number 7.
If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ______ and B at the ______ of the electrolytic cell.
Name two compounds that are covalent when taken pure but produce ions when dissolved in water.
Name the types of Hydrocarbons.
Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.
Reason (R): The forces of attraction between the molecules of ionic compounds are very strong.
