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A pale blue gas having a characteristic sharp smell restores the colour of blackened lead paintings.The gas is

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A pale blue gas having a characteristic sharp smell restores the colour of blackened lead paintings.The gas is
A. `O_(3)`
B. `O_(2)`
C. `SO_(2)`
D. `CI_(2)`
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Black lead sulphide is oxidized to while lead sulphate
`{:(O_(3)rarr O_(2) +O"]"xx4),(PbS+4O rarr PbSO_(4)),(bar(PbS+4O_(3) rarr PbSO_(4)+4O_(2))):}`
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