Which of the following substances does not conduct electricity?

A. Graphite
B. Glass
C. Sulphuric acid
D. Table salt solution

Never heard of a glass insulator?

By the way, ANY ionic material in solution as + and - ions conducts. Na+ and Cl- or 2H+ and SO4--

To determine which of the substances does not conduct electricity, we need to understand the concept of electrical conductivity and the properties of each substance.

A. Graphite: Graphite is a form of carbon and is a good conductor of electricity. This is due to the arrangement of carbon atoms, which allows delocalized electrons to move freely, carrying electrical charge.

B. Glass: Unlike metals and graphite, glass is an insulator and does not conduct electricity. Glass is primarily composed of non-metallic elements, such as silicon dioxide, which do not have free-moving electrons.

C. Sulphuric acid: Sulphuric acid (H2SO4) is an electrolyte, which means it can conduct electricity when dissociated into ions in aqueous solution. When dissolved in water, it dissociates into hydrogen ions (H+) and sulfate ions (SO4^2-), allowing the flow of electric charge.

D. Table salt solution: Table salt (sodium chloride, NaCl) is also an electrolyte. When dissolved in water, it breaks down into sodium ions (Na+) and chloride ions (Cl-), which can carry electric charge and allow for the conduction of electricity.

Therefore, the substance that does not conduct electricity out of the given options is B. Glass.