The correct statements regarding the behaviour of transition metals with respect to their oxidation states (A) Melting points of the compounds of transition metals with same element decreases with increase in oxidation number of transition metal. (B) Effective or valence state electronegativity of transition metal increases with increase in oxidation state of transition metal. (C) Transition metals exhibit metallic character in lower oxidation states but show non metallic character in higher oxidation states (D) Chromium can be easily oxidised to Cr+6 compared to molybdenum to Mo +6