Chemistry - Complete Pblock- Question with Solution | TestHub
How many of the following statements are correct regarding allotropes of carbon :
(a) Graphite is not a good conductor of electricity in perpendicular direction of layers at ordinary temperatures.
(b) Coke is the impure form of carbon.
(c) Anthracite is the purest form of Carbon.
(d) Buckminister fullerene contains 12 five membered rings and 20 six-membered rings.
(e) Diamond is a good conductor of Heat.
(f) Graphite is diamagnetic in nature.
(g) Graphite is thermodynamically more stable than diamond
Answer:
Solution:
Correct statements (6 total)
a) Graphite conducts electricity along its layers due to free electrons but is an insulator perpendicular to its layers.
b) Coke is an industrial, impure amorphous form of carbon.
d) Buckminsterfullerene () structurally consists of exactly 12 five-membered and 20 six-membered rings.
e) Diamond has an exceptionally high thermal conductivity due to its strong, rigid covalent lattice.
f) & g) Graphite is diamagnetic in nature and is the thermodynamically most stable allotrope at room temperature and pressure.
Incorrect statement (1 total)
c) Anthracite is the purest form of coal, not the purest form of carbon (allotropes like diamond and graphite are pure forms of carbon).
