2. There are pictures on the walls in your sitting room, aren't there? – You are mistaken. There are pictures there.

There are **some** pictures on the walls in your sitting room, aren't there? – You are mistaken. There are **no** pictures there. Explanation: 'Some' is used to indicate that there are a few pictures, while 'no' is used to indicate that there are no pictures at all because the speaker is mistaken.