Question

Which of the following acts as a self-indicator?

• A. $K_{2}C{r}_2{O}_7$
• B. $KMn{O}_4$
• C. Oxalic acid
• D. Iodine

Answer 1

Answer: (B)

$KMn{O}_4$ is purple coloured and it changes its colour during titration, hence it is a self-indicator.