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How many anions will give colourles acid...

How many anions will give colourles acid vapour/ gas with conc. `H_(2)SO_(4)` on reaction with following gives anions?
`CH_(3)COO^(-) ,Cl^(-),Br^(-),S^(2-),SO_(3)^(2-),BO_(3)^(3-),NO_(2)^(-),C_(2)O_(4)^(2-),I^(-)`

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The correct Answer is:
6
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