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Blue coloured gas X having a characteristic fishy odour, can restore the colour of lead parntmgs. Thi.s gas X can also be used for sterilizing water.

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Blue coloured gas X having a characteristic fishy odour, can restore the colour of lead parntmgs. Thi.s gas X can also be used for sterilizing water. identify the gas X. Mention the type of reaction(s) involved.
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Since X is a gas which is used in sterilizing water and has a characteristic fishy odour, it is `O_3.O_3` combines with black lead sulphide to give sulphate. It is a redox reaction.
`PbS+4O_3toPbSO_4+4O_2`
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