With respect to graphite and diamond, which of the statements given below are correct?
(1) Graphite is harder than diamond.
(2) Graphite has higher electrical conductivity than diamond.
(3) Graphite has higher thermal conductivity than diamond.
(4)Graphite has higher `C-C` bond order than diamond.

Options

A. Graphite is hareder than diamond.
B. graphite has higher electrical conductivity than diamond.
C. Graphite has higher thermal conductivity than diamond
D. Graphite has higher ` C-C` bodn ordr tha diamond .

Answer

B, D

Explanation

a. Diamon has a three-dimensional network structure . Whereas graphite is soft due to layerd structure .
b. In graphite only three valence electrons are invelved in bonding and one eelctron remains free, giving electricla conductivity . In diamond all the four valece electrons are covelently bonded hence insulator .
c. Diamond is a better thermal conductor than graphite Electrical conductivity is due to availbitity of electrons . Thermal condctance is due to transfer of thermal vibrational enrgy form one atom to another atom .`A` compact and prectisely movement of heat .
d. In graphite , `C-C` bond acquires some double bond charcte and hence has higher bond order than in diamond .