Which compounds yield hydrogen ions as the only positive ions in an aqueous solution?
(1) h2co3 and hc2h3o2
(2) h2co3 and nahco3
(3) nh3 and hc2h3o2
(4) nh3 and nahco3

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6