1) Which of the following compounds is metallic and ferromagnetic? A) $CrO_{2}$ B) $VO_{2}$ C) $MnO_{2}$ D) $TiO_{2}$ Answer: Option AExplanation:Only three elements iron (Fe), cobalt (Co) and nickel (Ni) show ferromagnetism at room temperature. CrO2 is also a metallic and ferromagnetic compound that is used to make magnetic tapes for cassette recorders.
