Which of the following is not a property of hydrochloric acid? A. It turns blue litmus red.
B. It is a strong electrolyte
C. It reacts with magnesium to form magnesium chloride and water.
D. It reacts with sodium carbonate to form sodium chloride, carbon dioxide and water.​

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