With respect to graphite and diamond, which of the following statement(s) given below is (are) correct ?

Options

A. Graphite is harder than diamond
B. Graphite has higher electrical conductivity than diamond
C. Graphite has higher thermal conductivity than diamond
D. Graphite has higher C-C bond order than diamond

Answer

B,D

Explanation

(a)Diamond is harder than graphite. Hence, (a) is incorrect.
(b) Graphite is a good conductor of electricity as each C-atom is attached to three other C-atoms and 4th electron is free while in diamond , all the four valencies are satisfied, it is insulator . Thus, (b) is correct.
(c ) Diamond is better thermal conductor than graphite. This is because thermal conduction is due to the transfer of thermal vibrations from atom to atom which is easier in a compact crystal like that of diamond. Hence , (c ) is incorrect.
(d) In graphite, C-C bond acquires some double bond character. Hence , it is has higher bond order than diamond. Thus , (d) is correct.