Compare the physical properties of two forms of carbon: diamond and graphite

Diamond and graphite are allotropes of carbon  and have various differences in their physical properties.

Explanation:

Diamond:

It is crystalline in natureEach  Each C is   hybridized and forms 4 covalent binds with neighboring  C atomsThe geometry is tetrahedralC-C bond length is 154 pmIt has rigid covalent boning which is difficult to break.It acts as an electric insulator

Graphite:

It has layered structureEach C atom is sp2  hybridized and forms 3 sigma  bonds with 3 other C atoms. Fourth electron forms pi bond. The geometry is planarC-C bond length is 141.5 pmIt is soft. Its layers can be separated easilyIt is good conductor of electricity.

This is the comparison of the physical properties of two forms of carbon: diamond and graphite

The answer to your question would be c. mineral oil  

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist