Which of the following is a decreasing order of oxidation states of the central atoms?

Which of the following complex has same oxidation state of the central metall atom in the cationic and anionic part ?

Which of the following complex has same oxidation state of the central metall atom in the cationic and anionic part ?

Which of the following oxides of halogen has maximum oxidation state of halogen atom?

In which of the following pairs of compounds, the hybrid state of the central atom is same?

Which order of the compounds is according to the decreasing order of oxidation state of nitrogen

In which of the following oxoanions the oxidation state of central atom is not same as that of its group number in periodic table ?