Maximum oxidation state (+8) is exhibited by

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Te & I

Co & Ni

Ru & Os

Cl & I

answer is B.

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Detailed Solution

Explanation:

Ruthenium (Ru) and Osmium (Os) are transition metals in the 8th group of the periodic table and can exhibit a maximum oxidation state of +8.
This is seen in their compounds like RuO₄ (Ruthenium tetroxide) and OsO₄ (Osmium tetroxide), where the metals have an oxidation state of +8.

Other options:

Co & Ni: These elements can show oxidation states of +2, +3, but not +8.
Cl & I: While chlorine and iodine can show high oxidation states, the maximum oxidation state they typically exhibit is +7 (as in ClO₄⁻ and IO₄⁻).
Te & I: Tellurium and iodine do not exhibit oxidation states as high as +8.

Final Answer

Maximum oxidation state (+8) is exhibited by Ru & Os (Option: Ru & Os)