Answer: C
Molar mass of AgCl is 143.5, so 1.435 g is 0.010 mol: only one of three Cl is ionic. The other two Cl and four NH3 fill six sites, so the cation is [Co(NHX3)X4ClX2]X+. Alphabetical order puts ammine before chlorido, and Co is +3 (x−2=+1).