Most of these are right, except I wouldn't use #4.
See your other post below for specifics.
1. When is the library open?
It is open from 8 a.m. to 5 p.m.
2. What time is the library open?
It is open from 8 a.m. to 5 p.m.
3. What are the opening hours of the library?
The opening hours are from 8 a.m. to 5 p.m.
4. What are opening hours of the library?
Opening hours are from 8 a.m. to 5 p.m.
5. What are the opening hours of the library?
It opens at 8 a.m. and closes at 5 p.m.
(Would you check the questions and the answers? Are they all grammatical? Which ones are common expressions?)
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