1.

The pair that act as both oxidising and as well as reducing agent is

Answer»

`NO,SO_3`
`NO_(2),H_(2)O_2`
`CO_(2),SO_(2)`
`N_(2)O_(5),O_3`

Solution :In order to act as REDUCING agent the compound should be in its MINIMUM OXIDATION STATE (or) should contains valence electrons `NO_2,H_2O_2` - can ACTS reducing as well as oxidising agents .


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