Blackened oil painting can be restored into original form by the action of 

  1. A

    Chlorine 

  2. B

    BaO2

  3. C

    H2O2

  4. D

    MnO2

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    Solution:

    H2O2The key reactions are
    PbO+H2S (black) PbS+H2O PbS+4H2O2PbSO4+4H2O (white) 
    When blackened statues are treated with H2O2the PbS is oxidised to PbSO4which is colourless (White). 

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