WAEC - Chemistry (2001 - No. 21)
Which of the following substances decomposes when an electric current is passed through it?
Glucose solution
Zinc rod
Hydrochloric acid
Tetrachloromethane
Explication
Glucose does not decompose when an electric current passes through it because it is a non-electrolyte and does not conduct electricity. However, hydrochloric acid (HCl) does decompose when an electric current passes through it because it is a strong electrolyte.