Number of moles of $\mathrm{H}^{+}$ ions required by 1 mole of $\mathrm{MnO}_{4}^{-}$ to oxidise oxalate ion to $\mathrm{CO}_{2}$ is ____.

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Redox Reactions and Electrochemistry

Number of moles of

H^{+}

ions required by 1 mole of

MnO_{4}^{-}

to oxidise oxalate ion to

CO_{2}

is ____.

Answer: 8

The balanced ionic equation for permanganate oxidizing oxalate in acidic medium is

2Mn O_{4}^{-} + 5 C_{2} O_{4}^{2 -} + 16 H^{+} \to 2M n^{2 +} + 10C O_{2} + 8 H_{2} O

For every 2 mol of

Mn O_{4}^{-}

, 16 mol of

H^{+}

are consumed, so per mole of

Mn O_{4}^{-}

, the

H^{+}

required is

16/2 = 8

mol.

JEE Main · 2024 · 31 Jan 2024 · Shift 2 · Integer answer