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प्रश्न
Compare the structure of the crystal of diamond & graphite with special reference to the reason for diamond being the hardest natural substance while graphite one of the softest. Compare the electrical & thermal conductivity of the two crystalline allotropes of carbon.
उत्तर
- Structure of crystal of diamond : Hardest natural substance is due to – strength and uniformity of the carbon – carbon covalent bond [tetrahadron structure].
It is bad conductor of electricity and heat due to abscence of free electrons in the crystal, i.e. no electron is free to move. - Structure of graphite : “Is soft and greasy due to parallel layers of C-atoms held together by weak VANDER WAAL – forces which slide over one another, i.e. hexagonal structure.
It is good conductor of heat and electricity due to – presence of mobile electrons in the crystal.
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संबंधित प्रश्न
Fill in the blank
Wood charcoal is a..........conductor of heat and electricity.
Name the following:
The best variety of coal.
Why is wood charcoal used in water filters and gas masks?
Descirbe the formation of coal
TRUE \ FALSE
Graphite is a poor conductor of electricity.
TRUE \ FALSE
Buckyball is a yellow amorphous solid.
Why does diamond sparkle?
How is wood charcoal a better fuel than wood?
Name the following:
An amorphous allotrope of carbon which floats on water.
Complete the statement by filling the blank with the correct word from the option.
A graphite-clay mixture baked at high temperature is used in making ______.
