the question is below

Question

A white solid is dissolved in water until the solution is homogenous. A conductivity meter was then inserted into the solution resulting in the light bulb illuminating. Which of the following is most likely the white solid?

1. a. C₁₂H₂₂O₁₁ (sugar)
2. b. HCl (hydrochloric acid)
3. c. N₂ (nitrogen gas)
4. d. NaCl (table salt)

Answer 1

Answer = d. NaCl. It dissociates producing ions which can conduct a current.

The only other electrolyte is b, HCl, but it is not a white solid.