How can you separate an inappropriately merged question on WikiAnswers?

Well, if it is a rude question you can simpley go to the little button on the top right hand screen. Its called [Improve]. You can change the question etc.

Click on the link "Edit Alternates" on the left hand side of the browser pane. This will show up all available alternate wordings for a question. You can select the incorrect question that has been merged with the current question and then click Split. This will separate the selected question as a separate question and remove it from the list of alternates from the current question.

Note: If you are not sure about what you are merging/splitting pls take the help of a senior member of the community or that category supervisor before doing so.