Q2 of 33 Page 223

Assertion: Diamond is the hardest crystalline form of carbon.

Reason: Carbon atoms in diamond are tetrahedral in nature (Verify the suitability of reason to the given Assertion mentioned above)


i. In diamond, every carbon atom is covalently bonded to four


neighbouring atoms in a tetrahedral way.


ii. This leads to a tetrahedral three dimensional structure.


iii. Structure of diamond is given below:



iv. This fact is responsible for its hardness and rigidity.


More from this chapter

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1

Assertion: Chemical bonds in organic compounds are covalent in nature.

Reason: Covalent bond is formed by the sharing of electrons in the bonding atoms.


Does the reason satisfy the given assertion?


 3

Assertion: Due to catenation a large number of carbon compounds are formed.

Reason: Carbon compounds show the property of allotropy.


Does the reason hold good for the given Assertion?


 4

Buckminster fullerene is the allotropic form of _______ .(Nitrogen / Carbon / Sulphur)

 5

Even though it is a non-metal, graphite conducts electricity. It is due to the presence of ___________ . (free electrons / bonded electrons)