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Among the following, total number of ani...

Among the following, total number of anions, which decolourises the potassium peramagnate solution in acidic medium
`C_(2)O_(4)^(2-), NO_(2)^(-), (BaCI_(2)+SO_(4)^(2-)), S_(2)O_(3)^(2-), NO_(3)^(-)`

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The correct Answer is:
3
`C_(2)O_(4)^(2-), NO_(2)^(-), S_(2)O_(3)^(2-)`
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