An unknown substance has been shown to have metallic bonds.

Which of the following is most likely a property of this substance?
A. low melting point
B. high conductivity
C. low pH
D. high solubility in water

is it B?

Yes, B is correct.

To determine the most likely property of a substance with metallic bonds, we need to understand what metallic bonds are and how they influence the properties of a substance.

Metallic bonds are formed between metal atoms where the outer electrons can move freely throughout the entire metal lattice. This results in a sea of delocalized electrons shared among all the metal atoms. These delocalized electrons are responsible for several characteristic properties of metals.

Considering the given options, the property that best aligns with metallic bonds is high conductivity. The free-flowing delocalized electrons in metallic bonds allow for the easy movement of electric charge, resulting in metals being excellent conductors of electricity and heat.

So, the correct answer is B. High conductivity is the most likely property of a substance with metallic bonds.