The reason why informed consent is used to give participants with complete information about a research study, this is sometimes impossible because:
This refers to the permission which is given to a person in order to perform an action or a task that is outside his jurisdiction or rights to perform.
With this in mind, we can see that when there is the research work going on, there can sometimes be the use of deception which is an important part of the research and this voids the informed consent which is given to the participants of the study.
Read more about consent here:
https://brainly.com/question/7987645