Which option is an example of a physical property?

boiling point

ph

toxicity

rusting ability

Boiling point

pH is the chemical composition(whether acid or base) and toxicity is the degree in which a substance damages an organism(its basically like poison) and the rusting ability is a chemical change because it is two substance acting together to form a new substance, example when iron rusts, iron molecules react with oxygen molecules to form a new substance called iron oxide

Sorry i dont understand the question can you rephase it?

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