Question

multiple choice items
which compound will most likely form when an element in group 1 reacts with an element in group 17?
a sulfuric acid, h₂so₄
b calcium fluoride, caf₂
c hydrochloric acid, hcl
d hydrogen sulfide, h₂s

Explanation:

Group 1 elements (alkali metals) form +1 ions, group 17 (halogens) form -1 ions. They combine in 1:1 ratio.

• A: \(H_2SO_4\) has S, not group 1/17.
• B: Ca is group 2, not 1.
• C: H (group 1) and Cl (group 17) form HCl (1:1).
• D: S is group 16, not 17.

So HCl fits.

Answer:

C. hydrochloric acid, HCl