1) What was the role of zubair ibn awam? He came against Imam Ali?
2) In beginning he was with imam Ali? He was his supporter and he also fought for Bibi fatima's right?
3) Did prophet told him that he is guaranteed to be in jannah?
4) Is there any aayah in surah hajar for Talha and Zubair that on day of judgement there hearts will be pure?

1- Yes. He stood against Imam, although he knows that he is wrong
2- Yes
3- No. Prophet did not guaranteed that.
4- There is no such Verse.