Q 1 :    

Aqueous solution of which of the following compounds is the best conductor of electric current?            [2015]

• Hydrochloric acid, HCl

   

• Ammonia, ${\mathrm{NH}}_3$

   

• Fructose, ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$

   

• Acetic acid, ${\mathrm{C}}_2{\mathrm{H}}_4{\mathrm{O}}_2$