If Pt in PtCl4.2HCl has a secondary valence of 6, how many mols of AgCl will 1 mol of the compound precipitate with excess AgNO3?

Correct Answer: 0
Since the secondary valence is 6, the compound should have six groups linked to Pt atom. But it already has six groups linked to it and cannot lose any Cl atoms to form AgCl. Hence, no AgCl will be produced.