Allotropes of carbon MCQ — 2 Practice Questions with Answers

Explanation

Fullerene is a molecular form of carbon with cage-like structures. In this question, the accepted use is the purification of natural gas, where carbon nanomaterials can help in adsorption and separation processes. Making electrodes is more typically associated with graphite or other conductive carbon materials in basic exam contexts. Cutting rocks and stones points to diamond because of its hardness. Manufacturing jewellery also mainly refers to diamond or other gemstones, not fullerene. Hence the use retained by the official key is natural gas purification.

Explanation

Hydrocarbon is not an allotrope of carbon; it is a compound made of carbon and hydrogen. Allotropes are different structural forms of the same element in the same physical state. Diamond is a crystalline allotrope of carbon with a three-dimensional network. Graphite is another carbon allotrope, with layered sheets. Fullerene is also an allotrope, made of carbon atoms arranged in cage-like structures. Since hydrocarbon contains hydrogen along with carbon, it cannot be counted as a pure carbon allotrope.