A. -ide (Ferrous Sulfide; Sodium Chloride; Sodium Hydroxide; Lead(II) cyanide).
1) A 2) B
I’ll make a guess! (A). Ferrous sulfide, Sodium Chloride, Sodium Oxide, Lead Carbon Nitride
These are all binary ionic compounds, which are named with the cation (positively charged ion) first, and then the anion. The anion suffix is ‘ide’, typically, save for oxygen-containing polyatomic ions.
Your answer is A, ‘-Ide’
A. (sulphide, chloride, hydroxide, cyanide)