The order of decreasing strength as reducing agent is SO₂ > MnO₂ > PbSO₄.
Standard reduction potential is defined as the reducing power of any element or compound
The standard reduction potential of SO₂ is 2.4V.
The standard reduction potential of PbSO₄ is -0.12V.
The standard reduction potential of MnO₂ is 1.23V.
The species or compound which oxidize itself and reduce other species or compound by loosing electron is termed as reducing agent.
As we know that, with the increase in the standard reduction potential, the reducing power of particular species decreases.
The increasing order of standard reduction potential is PbSO₄ < MnO₂ < SO₂.
Thus, the decreasing strength as reducing agent is SO₂ > MnO₂ > PbSO₄.
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