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Which one of the following materials is not an allotrope of carbon ?

June 1, 2025 by rawan239

Which one of the following materials is not an allotrope of carbon ?

Diamond

Graphene

Fly ash

Fullerene

This question was previously asked in

UPSC NDA-1 – 2021

Download PDF Attempt Online

Fly ash is a residue produced from the combustion of pulverized coal in thermal power plants. It is primarily composed of fine particles of various oxides and minerals, such as silicon dioxide (SiO₂), aluminium oxide (Al₂O₃), iron oxide (Fe₂O₃), and calcium oxide (CaO), along with some unburnt carbon. It is not a pure form of carbon existing in a specific structural modification like diamond, graphene, or fullerene.

Allotropes are different forms of the same element in the same physical state. Carbon exists in many allotropic forms due to its ability to bond in various ways. Common allotropes include diamond (tetrahedral sp³ bonding), graphite (layered sp² bonding), graphene (single layer of graphite), fullerenes (spherical or elliptical sp² bonding, like C₆₀), carbon nanotubes, and lonsdaleite.

Fly ash is often used as a pozzolanic material in concrete mixtures, improving its properties. While it contains some unburnt carbon, its composition is complex and includes many non-carbon components, classifying it as an industrial byproduct rather than an allotrope of carbon.

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