Choose the correct statement(s) among the following.

A

$$SnCl_2.2H_2O$$ is a reducing agent.

B

$$SnO_2$$ reacts with KOH to form $$K_2[Sn(OH)_6]$$.

C

A solution of $$PbCl_2$$ in $$HCl$$ contains $$Pb^{2+}$$ and $$Cl^−$$ ions.

D

The reaction of $$Pb_3O_4$$ with hot dilute nitric acid to give $$PbO_2$$ is a redox reaction.