Which of the following is not the characteristic of transition metals ?
They are all metals
They show variable oxidation states which always differ by two units
They are paramagnetic
They easily form complexes
Transition elements are all metals and generally show variable oxidation states.
Unlike p Block elements which show a difference in oxidation states by two, these elements show a difference of oxidation state of only one unit. This is because of incomplete filling up of electrons in the d orbitals.
Due to small size and high charge density, they can form complexes
Therefore, option (2) is correct.