Question

A form of carbon that is a good conductor of heat is

• A. diamond
• B. graphite
• C. wood charcoal
• D. coke

Answer 1

The correct option is B

graphite

The explanation for the correct option:

Option B: graphite

• Graphite is an allotrope of $\mathrm{carbon}\left(\mathrm{C}\right)$.
• It is a good conductor of heat and electricity.
• This is because, like metals, graphite contains delocalized (free) electrons.
• These electrons are free to move through the structure of the graphite.

The explanation for the incorrect option:

Option A: diamond

• Diamond is an allotrope of $\mathrm{carbon}\left(\mathrm{C}\right)$.
• The structure of diamond is shown in the figure.
• It can be clearly seen that each carbon atom in a diamond is covalently bonded to four other carbon atoms, leaving no electrons to move freely and since electrical conductivity is due to the movement of free electrons, hence diamond is a poor conductor of electricity

Option C: wood charcoal

• These forms of $\mathrm{carbon}\left(\mathrm{C}\right)$are obtained when the wood is heated in the absence of air.
• In the amorphous form of carbon, carbon atoms are arranged in a random manner.
• It can not a good conductor of heat.

Option D: coke

• When coal undergoes destructive distillation, it produces many products such as coal gas, coal tar, coke, etc.
• In the amorphous form of $\mathrm{carbon}\left(\mathrm{C}\right)$, carbon atoms are arranged in a random manner.
• It can not a good conductor of heat.