UPSC NDA I 2023 General Ability Solved Paper

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Question : 109 of 150

Marks: +1, -0

Which among the following statements is not correct with respect to allotropes of Carbon?

Graphite is a good conductor of electricity.
Diamond is the hardest substance known.
Fullerene is one of the allotropes of carbon.
Next to diamond, graphite is the second hardest known substance.

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