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How many of the following reagents can b...

How many of the following reagents can be used to distinguish between `SO_(2)` and `CO_(2)`?
`Ca(OH)_(2)`, (strach `+KIO_(3)),(K_(2)Cr_(2)O_(7)+H_(2)SO_(4)),(KMnO_(4)+H_(2)SO_(4)),Ba(OH)_(2),FeCI_(3),Zn[Fe(CN)_(5)(NO)]`

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The correct Answer is:
5
(Strach `+KIO_(3)),(K_(2)Cr_(2)O_(7)+H_(2)SO_(4)),(KMnO_(4)+H_(2)SO_(4)),Ba(OH)_(2),FeCI_(3),Zn[Fe(CN)_(5)(NO)]`
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