Acid is reducing while teo2 is an oxidizing agent
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Its +4 os to +6 os snd can be behave as reducing agent.But in TeO2.Te is heaver element.electrons are reluctant to take part in bond formation due to poor shielding of d- and f-orbitals thus lower oxidation states (+2, -2) becomes more stable( inert pair effect) and hence TeO2 is oxidising agent.
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