Question

Which of the following acts as a self-indicator?

• A. $K_2Cr_2O_7$
• B. $KMnO_4$
• C. Oxalic acid
• D. Iodine

Answer 1

Answer: (B)

$KMnO_4$

Answer 2

$KMnO_4$ is purple coloured and it changes its colour during titration, hence it is a self-indicator.