A definite amount of reducing agent is oxidised by 20 mL of in acid medium

CHEMISTRY · Single correct · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

A definite amount of reducing agent is oxidised by 20 mL of

1\text{M}

\text{KMnO}_4

in acid medium, then the same amount of reducing agent is oxidised in same state by how many mL of

1\text{M}

\text{KMnO}_4

in neutral medium it self changing to

\text{Mn}^{4+}

state : (1) 3 mL (2) 33.3 mL (3) 12 mL (4) 24 mL