IMHO, there comes a point where the questions become too demanding, and show no signs of work on the students part, at which time, no one wants to give answers. That point can come sooner, rather than later, when someone copies 95 questions from an online assignment, and just goes away. Obviously, we can all just ignore the posts we don't feel like answering. But anyone can feel a little disappointed when a favorite online spot degenerates into a pit of spam and fail.
As for explicit rules, the student is supposed to show some work. These scavenger hunt questions make verifying that dicey -- a student can work real hard on the first 5, palm off the next 11, work on 2 more, palm off the next 15, ask for just the last 2 -- then dump the remaining they said they'd done -- each question in the list of 95 is unique, working out one doesn't help on the others. So you can't say they haven't tried at all, but can you say they have they really worked on the problem you're helping with?
These scavenger hunts were famous years ago. Every so often, on the Usenet someone would want the answers to very obscure chemical questions such as:
1. A white cloth is dipped in turmeric solution until it gets yellow.
It is then dried and the turmeric powder sticking on the cloth
removed. A person washes his feet in slaked lime water and walks on
and walks on [sic] the cloth. Red foot prints appear.
2. Aluminum coin (five / ten paise) when rubbed with saturated
mercuric chloride solution on palm, gets heated and a gray substance
starts forming on the coin. Washing the coin starts the reaction
and the big favorite,
5. Yellow phosphorous is mixed with wet cow-dung cake. When it dries
in the sun fire is produced.
You were never expected to perform these operations, you were expected to walk around the university, chatting with upperclassmen and professors to glean their experience, search the library for obsolete texts, as a rite of passage, learning how hard it is to discover this info. The internet screwed that procedure all up. I bet if I go on YouTube I can see that dung experiment