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प्रश्न
Answer the following question
Why is diamond very hard?
उत्तर
A diamond is a giant molecule. The number of valence electrons in carbon atom is four. As such each carbon atom is linked with four neighboring carbon atoms. Thus forming a rigid tetrahedral structure. It is the strong bonding’that makes diamond the hardest substance.
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संबंधित प्रश्न
______ and ______ are the two major crystalline allotropes of carbon.
Choose the correct alternative.
Graphite is not found in
Define the Following Term:
Crystal
Write three differences between graphite and diamond.
Fill in the blank
Coal is a ............. form of carbon.
Fill in the blank:
......... is the most inferior form of coal.
Write ‘true’ or ‘false’ against the following statement:
Activated charcoal is a good conductor of electricity.
TRUE \ FALSE
Coal can be converted to coke by destructive distillation.
TRUE \ FALSE
Buckyball is a yellow amorphous solid.
TRUE \ FALSE
Pure diamond can occur in several colours.
