You must make an aqueous solution that will be a good conductor of electricity. you can pick two substances to add to the water. pick the two substances that you could add to water to make it the strongest conductor possible.
i) water
ii) sugar
iii) hydrochloric acid
iv) salt
a) i and ii
b) ii and iii
c) ii and iv
d) iii and iv

D) III and IV  

Explanation: Conductors are substances which can easily conduct electricity through them. The solutions which conducts electricity are called as electrolytic conductors and conduct by production of free ions.

Thus the substances to be dissolved in water must dissociate to give ions.

Water being strongly bonded through hydrogen bonds do not dissociate and sucrose being a covalent compound do not dissociate into ions.

Salt being ionic compound easily dissociate and hydrochloric acid  is an acid which dissociates in water to give {[ex]H^+[/tex] ions.

as technology advances, new experiments often expose problems in accepted theories. c

hope i

-lavira: )