Silver halides are totally insoluble in nitric acid.

Ag₂S and AgCN are soluble in acidic medium.

S₂⁻ and CN⁻, if present, are decomposed by conc. HNO₃ and hence do not interfere in the test.

Ag reacts faster with halides in acidic medium.

Cr³⁺   and   Co³⁺

Co³⁺    and    Cr³⁺

Co³⁺    and    Co³⁺

Cr³⁺    and    Cr³⁺

[Co(NH₃)₆]Cl₃

[Pt(NH₃)₂Cl₂]

[Co(NH₃)₄Cl₂]

[Co(NH₃)₅Cl]Cl₂

Iron corrodes in oxygen-free water.

Iron corrodes more rapidly in salt water because its electrochemical potential is higher.

Corrosion of iron can be minimized by forming a contact with another metal with a higher reduction potential.

Corrosion of iron can be minimized by forming an impermeable barrier at its surface.