Advertisements
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Choose the correct alternative.
A crystalline form of carbon is
Write true or false
Graphite has layers of hexagonal carbon bondings.
Write true or false
Diamond is insoluble in all solvents.
Name the following:
A greyish black non- metal that is a good conductor of electricity.
Give two uses of graphite.
Write ‘true’ or ‘false’ against the following statement:
Coal gas is used in the preparation of artificial ferilizers.
Why is wood charcoal used in water filters and gas masks?
Descirbe the formation of coal
TRUE \ FALSE
Synthetic diamonds are used for cutting glass and drilling rocks.
TRUE \ FALSE
Buckyball is a yellow amorphous solid.
