10ml of KMnO(4) titrates 28ml of 0.1M H(...

`10ml` of `KMnO_(4)` titrates `28ml` of `0.1M` `H_(2)C_(2)O_(4)` in acidic medium. Another `10ml` when added to excess `NH_(2)OH` liberates `N_(2)`. The volume of `N_(2)` at STP is____
`37.6ml`
`22.4ml`
`48ml`
`56ml`

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