Question bank/JEE Main/Chemistry

JEE MainChemistryModerateInorganic Chemistry

Assertion: Among the carbon allotropes, diamond is an insulator,
whereas, graphite is a good conductor of electricity. Reason:
Hybridization of carbon in diamond and graphite aresp^3 and sp^2,
respectively.

Show answer and solution
Diamond has carbon atoms that are bonded via a covalent bond to
four other carbon atoms in a tetrahedral manner.
Thea=a02=btma = \frac{a_{0}}{\sqrt{2}} = \frac{bt}{m}
hybridization of carbon atom in diamond is
a02=btm\frac{a_{0}}{\sqrt{2}} = \frac{bt}{m}. In
=10−2t0.1=t10= \frac{10^{- 2}t}{0.1} = \frac{t}{10}
diamond, carbon utilizes its unpaired electrons in the formation of the
bond. Therefore, it is a poor conductor of electricity.
A trigonal geometry is obtained when a carbon atom in graphite is bonded
via a covalent bond to three other carbon atoms.
Thea02=a0et10\frac{a_{0}}{\sqrt{2}} = a_{0}e^{\frac{t}{10}}
 hybridization of carbon atom in graphite
is 12=e−110\frac{1}{\sqrt{2}} = e^{- \frac{1}{10}}. In 
ln2=t10ln\sqrt{2} = \frac{t}{10}
t = 3.5 sec
graphite, the three unpaired electrons of carbon is utilized in the
formation of the bond. Therefore, it is a good conductor of electricity.

Source: Grass-G / CH-22 Chemistry Paper 19 Dec. Eng.docx

More JEE Main questionsChapter practice

Need a video for this idea?

Scan any doubt from your notes and get a whiteboard explanation.

Scan a doubtView plans