3. The endpoint of a titration involving the reaction of MnO4- to Mn2+ can be detected by the ... *

A) useofa pH probe.
B) use of redor blue litmus.
C)pink colour of the Mn+2.
D)addition of an indicator like methyl orange.

The solution of manganese ion, Mn2+ is colorless. This way, the reaction involves a colour change from pink to transparent.

There is no option with this information.

So, the best answer is (A)

1.solid

2.carbon dioxide

3.helium