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How many of the following gases/vapours ...

How many of the following gases/vapours are colourless?
`CO_(2),SO_(2),H_(2)S,NO_(2),HCl,Br_(2),I_(2),CO,Cl_(2)`

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The correct Answer is:
5
Colourless gases: `CO_(2),SO_(2),H_(2)S,HCl,CO`
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