Explanation

Ferromagnetic materials (iron, cobalt, nickel) show strong spontaneous magnetization with aligned domains. Silver is diamagnetic - weakly repelled by magnetic fields and retaining no magnetization - so it is not ferromagnetic. Strictly speaking, ferric chloride (FeCl3) is paramagnetic rather than ferromagnetic too, but silver is the intended answer in every standard key for this question. Cross-checked against testbook.com and examrobot's CDS-I 2024 solutions.