Which of the following is false?....

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Which of the following is false?
(1) The difference between the two oxidation states
P
of a transition element is unity.
(2) The higher oxidation state is favourable for tungsten and the lower oxidation state is favourable for chromium.
(3) Scandium does not show a variable oxidation state.
(4) The lower oxidation state is favourable if a complex is formed with \( \pi \)-donor ligand


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