67th B.P.S.C. (Pre) 2022
Which of the following statements about graphite and diamond is true?
aThey have the same crystal structure
bThey have the same hardness
cThey have the same electrical conductivity
dThey can undergo a similar chemical reaction✓ Correct
eNone of the above / More than one of the above
Explanation
Graphite and diamond are both allotropes of carbon, but their crystal structures are different. Diamond is naturally the hardest substance, whereas graphite is less hard. Graphite has higher electrical conductivity than diamond. Since both graphite and diamond are made of carbon atoms linked by covalent bonds, their chemical properties are similar and they can undergo the same chemical reactions.
general-science