A non-metal which is a good conductor of electricity is:

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Graphite

Hydrogen

Sodium

Mercury

answer is A.

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Detailed Solution

Concept- Graphite- The carbon atoms in graphite are organised into numerous sheets of hexagonal rings held together by weak Vander Waals interactions.
Each carbon atom is connected to three other carbon atoms in the arrangement, leaving one free electron in the valence shell, making it an excellent conductor.
Hydrogen- Hydrogen is a non-metal that conducts electricity well only at extreme pressures. As a result, it cannot be the proper response.
Sodium- Sodium is an excellent conductor of electricity, although it is classified as an alkali metal since it is an s-block element. As a result, it isn't non-metal. Therefore, it is also incorrect.
Mercury- Mercury is a metal as well. As a result, it is unlikely to be the correct answer.
Hence, the correct answer is 1.

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