$MnO _4^{-}$oxidises $(i)$ oxalate ion in acidic medium at $333\, K$ and $(ii)$ $HCl$. For balanced chemical equations, the ratios $\left[ MnO _4^{-}: C _2 O _4^{2-}\right]$ in $(i)$ and $\left[ MnO _4^{-}: HCl \right]$ in $(ii)$ respectively are

  • [KVPY 2011]
  • A
    $1: 5$ and $2: 5$
  • B
    $2: 5$ and $1: 8$
  • C
    $2: 5$ and $1: 5$
  • D
    $5: 2$ and $1: 8$

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