* Lead(II) sulfate (PbSO₄): This compound is insoluble in nitric acid, even though lead(II) nitrate is soluble. This is because the sulfate ion (SO₄²⁻) forms a very strong ionic bond with lead(II) ions, making the compound highly stable and resistant to dissolution.
* Lead(II) chloride (PbCl₂): This compound is insoluble in concentrated nitric acid but soluble in dilute nitric acid. This is because the chloride ion (Cl⁻) can be displaced by nitrate ions in dilute nitric acid, but not in concentrated acid.
* Lead(II) oxide (PbO): While lead(II) oxide dissolves in nitric acid to form lead(II) nitrate, the reaction is slow. This is because the oxide layer on lead metal acts as a barrier, slowing down the reaction with the acid.
Therefore, the only compound of lead that is definitely insoluble in nitric acid is lead(II) sulfate (PbSO₄). While lead(II) chloride can also be considered insoluble in concentrated nitric acid, it is soluble in dilute acid.
