Advertisements
Advertisements
प्रश्न
Why is graphite a good conductor of electricity but diamond is a non-conductor of electricity?
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Give reason why carbon compounds are generally poor conductors of electricity.
What would be the electron dot structure of carbon dioxide which has the formula CO2?
Name the black substance of pencil. Will the current flow through the electrical circuit when we use the sharpened ends of the pencil to complete the circuit?
Why is graphite used for making dry cell electrodes but diamond is not?
Using electron-dot diagrams which show only the outermost shell electrons, show how a molecule of nitrogen, N2, is formed from two nitrogen atoms. What name is given to this type of bonding? (Atomic number of nitrogen is 7)
Draw the electron-dot structure of NH3 and state the type of bonding.
The electronic configurations of three elements X, Y and Z are as follows:
| X | 2, 4 |
| Y | 2, 7 |
| Z | 2, 1 |
(a) Which two elements will combine to form an ionic compound?
(b) Which two elements will react to form a covalent compound?
Give reasons for your choice.
A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads.
(a) What is element X?
(b) Name the allotrope Y.
(c) State whether allotrope Y is a good conductor or non-conductor of electricity.
(d) Name one use of allotrope Y (other than lubrication and pencil leads)
(e) Name two other allotropes of element X.
Give two example in following case:
Liquid non polar compounds
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methane
Give examples for the following:
Two gaseous non polar compounds.
Electrons are getting added to an element Y:
Is Y getting oxidised or reduced?
Acids dissolve in water and produce positively charged ions. Draw the structure of these positive ions.
Name the anion present in the following compound:
When a barium chloride solution is added to a solution of compound B, a white precipitate insoluble in dilute hydrochloric acid is formed.
Define the functional group and complete the following table.
| S.I. No. | Functional Group | Compound | Formula |
| (1) | ______________ | _______________ |
C2H5OH |
| (2) | _______________ | _______________ | CH3CHO |
Your body is made up of carbon.
Write a short note.
Aromatic hydrocarbons
What is a covalent bond?
Show the covalent bond formation in nitrogen molecule.
Non-polar covalent compounds are ______ conductors of heat and electricity.
