He is unhappy, is he? or ,isn't he? Is ''unhappy '' a negative word?
The others like,
1. We are unable to see the word clearly, are we? or aren't we?
2. This is impossible, is it? or isn't it?
3. He is impolite, and nor is the girl. or and so is the girl.
4. The unfair treatment is unacceptable, isn't it? or is it?
5. The trip is unforgettable, and so is the friend i met. or neither is the friend i met.
The ordinary tag question is in the negative. If it is in the positive, it becomes challenging, like "So, you're unhappy, are you? " The other two take "so".
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The ordinary tag question is in the negative. If it is in the positive, it becomes challenging, like "So, you're unhappy, are you? Well, you are going to be even more unhappy when I get done with you." The other two take "so".
The key to this is the main verb. The main (indeed, only) verb in each of your sentences is affirmative.