General tips:

⁃ not a lot of questions (3-4 maximum I would say)

⁃ Not ONLY questions about salary and social package

⁃ Most probably your motivation (what motivates you) would be assessed by the questions you asked

⁃ Would be good to ask what really you are interested in / worried about (but remember about previous comments). You also need more information about company / position / people to make your choice

⁃ Questions about company, team, challenges of the position, prospects for self-development - it work well