Interested in Language
The sentences below are grammatically correct. However, my doubt is: If I ommit the noun, supposing it's implied (if I'm holding the object or clearly poiting at it, for example).
1) Whose book is it/this? (it's ok)
2) Whose is it? / Whose is this? (is it possible?)
Not a teacher.
'This' is more likely, unless you have mentioned the object before:
Whose is this?
I have just found this. Whose is it?