Question

How long did it take for the color to change from purple to colorless when the first addition of mno4- was made?

a. Instantaneously
b. 5 minutes
c. 10 minutes
d. 15 minutes

Answer 1

The color change from purple to colorless when the first addition of
`MnO_4-`was made was instantaneously. Option A is correct.

When
`MnO_4-`was added for the first time, the hue changed instantly from purple to colorless. This is due to the extremely quick reaction that occurs between
`MnO_4-`and the reducing agent, which is often an iron(II) ion.

So, The permanganate ion
`(MnO_4-),` which is reduced to the colorless manganese(II) ion
`(Mn_2_+)` during the reaction, is responsible for the purple color of
`MnO_4-.`

Therefore, Option A is correct.