Which of the following statements about permanganate titrations in the laboratory are correct?

A $KMnO X_{4}$ acts as its own indicator, the end point being the first permanent pale pink colour
BDilute $H X_{2} SO X_{4}$ is the suitable acid for providing the acidic medium
CDilute $HCl$ is unsuitable because $Cl X^{-}$ is oxidised by $MnO X_{4} X^{-}$ , causing an error
DIn neutral medium the n-factor of $KMnO X_{4}$ is 5

Answer: A, B, C

Permanganate is intensely coloured, so a slight excess gives a permanent pink end point. Dilute

H X_{2} SO X_{4}

is inert towards it, whereas

HCl

is oxidised (and

HNO X_{3}

is itself an oxidant). In neutral medium Mn goes from +7 to +4, so n = 3, not 5. Hence A, B and C are correct.