Q.

Which of the following is not a property of carbon?


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a

Carbon compounds are good conductors of heat and electricity

b

Carbon compounds are poor conductors of heat and electricity

c

Most of the carbon compounds are covalent compounds

d

Boiling and a melting point of carbon compounds are relatively lower than those of ionic compounds. 

answer is A.

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Detailed Solution

Carbon compounds are good conductors of heat and electricity is not a property of carbon.
Carbon compounds are poor conductors of heat and electricity as they form covalent bonds and do not give rise to any free electrons or ions as all the electrons are shared to make covalent bonds. The carbon compounds do not dissociate themselves into ions which makes them poor conductors of electricity and heat. Most carbon compounds are covalent compounds as the carbon atom cannot form a cation or anion, as gaining 4 electrons or losing 4 electrons is not easy, so they share their electrons and form covalent bonds, which are stronger than ionic bonds. The boiling and melting point of a covalent compound is lower than those of ionic compounds.
 
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