Answer : The correct option is, It is when a change that indicates equivalence is observed in the analyte solution.
Explanation :
Titration : It is a laboratory process where we have to use the volume of a solution of known concentration to determine the concentration of unknown solution.
Titrations mostly occur in redox reactions and acid-base reactions.
During the process of titration, there are two important stages which are endpoint and equivalence point.
Equivalence point : It is a point in which the added titrant is equivalent to the analyte in the sample.
Endpoint : It is a point where the indicator changes its colour that means it is a change that indicates equivalence observed in the analyte solution.
Hence, the correct option is, It is when a change that indicates equivalence is observed in the analyte solution.
