What is the proof that the graphite and diamond are different forms of element carbon?

Which statement shows that diamond and graphite are different forms of the element carbon?

a. Both have giant molecular structures.b. Complete combustion of equal masses of each produces equal masses of carbon dioxide as the only product. c. Graphite conducts electricity, whereas diamond does not.d. Under suitable conditions, graphite can be converted into diamond.

 My answer is d.  

 What is the correct answer?

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  • 1 month ago
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    The answer: b. Complete combustion of equal masses of each produces equal masses of carbon dioxide as the only product.

    a. false

    Some other substances, like silicon, also have giant covalent structures.

    b. true

    Equal masses of two substances react with equal masses of oxygen to form equal masses of carbon dioxide as the only product. This can deduce that the two substances both are carbon. However, they are different substances. Hence, they are different forms of carbon.

    c) false

    Some other substances, like metals, can also conduct electricity.

    d) false

    The conversion from graphite into diamond only shows that they are the different forms of the same substance, but does not show that they are different forms of carbon.

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