Q. Which of the following is a conductor of electricity ?
Answer: Salt water
Notes: Pure water is actually an extremely poor conductor, but saturated salt water is a good conductor. The saltier the water, the better the conductance. The reason it conducts electricity is because the salts such as NaCl (sodium chloride) breaks apart into a positively charged Na+ and a negatively charged Chloride Cl-. When current is applied, it is easily conducted by the highly charged ions.