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CBSE Class 10 Answered

give reasons: 1.  Diamond has a high melting point 2. element carbon forms compounds mainly by covalent bonding 3. carbon compounds do not conduct electricity in molten state?
Asked by rs1702 | 31 Dec, 2018, 01:11: PM
answered-by-expert Expert Answer
1) It has a 3-D interconnected tetrahedral structure due to which it has high MP and BP moreover, it has all the four valence electron bonded as a sigma bond, unlike graphite which has only three and fullerene which has the fourth bond as the weak pi bond which gives it extra strength.
 
2) Carbon has 4 electrons in its valence shell. To attain stability, it should either gain 4 electrons or lose 4 electrons. It cannot lose 4 electrons as it involves a lot of energy. Also, it cannot gain 4 electrons because the nucleus cannot hold on to the four extra electrons added. Therefore, to complete the octet, it shares 4 electrons with other atoms. That is why carbon forms compound mainly by covalent bonding. 
 
3) Polar covalent compounds conduct electricity. In the pure state, water is a poor conductor of electricity. In the presence of a small amount of an acid or a base, it gets ionized and conducts electricity.
Non-polar covalent compounds do not conduct electricity due to the absence of ions.
Answered by Ramandeep | 31 Dec, 2018, 02:55: PM
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