Graphene is ________.
- AAn alloy of carbon
- BNano structure of carbon
- CIsotope of carbon
- DNone of the above
Show answer and explanation
Correct answer: (b) Nano structure of carbon
Explanation
Graphene is a single sheet of carbon atoms, a nanostructure (allotrope) of carbon.
It is not an alloy or an isotope; alloys mix metals and isotopes differ in neutron number.
It is a pure carbon form and an excellent conductor of electricity; stacked layers form graphite.