Research time :D =^.^=

It might be easier to perform data analysis, but isn't it undermining the precision of results?

I had same issue when reading questions.
How ever we wanted to be, world in not black and white, nor are answers on those questions.
There is reason why most questionnaires use 5 tiered answer sheet.

I think the neutral answer is not a very good idea - it removes some polarity from the question - you get to sort of evade the question. Two milder, but still clearly positive or negative answers seem better to me. Although in the end it depends on the analysis the author is to perform.

True, but I think when you say "Chemical" most people will think of some form of medicine/toxic chemicals. Obviously not everyone knows the effects of every chemical, and certainly doesn't need to... Makes me curious as to what is the purpose of this question?

Asking about mental conditions, self-image, beeing sick etc. It feels weird when it gets to giving honest answers. Like I was stripping in front of people or something like that ^^

Make total sense. I think that only people with exaggerated self importance would answer 'yes' to the last one.