Which of the following is a conductor of electricity?

• A. Glucose solution
• B. Aqueous NaCl solution
• C. Solid NaCl
• D. Distilled water

Answer: (B)

Verified step by step guidance

1. Understand that electrical conductivity in substances depends on the presence of charged particles (ions or free electrons) that can move freely to carry electric current.
2. Recognize that solid NaCl is an ionic compound where ions are locked in a crystal lattice, so it does not conduct electricity in solid form because ions cannot move freely.
3. Know that distilled water is pure H2O with very few ions, so it is a poor conductor of electricity.
4. Realize that glucose solution contains molecules that do not ionize in water, so it does not provide charged particles to conduct electricity.
5. Identify that aqueous NaCl solution contains dissociated Na+ and Cl- ions, which are free to move and carry electric current, making it a good conductor of electricity.