Is it necessary to do iddah, if the husband and wife are separated for 10 years and wife want to take khula after marrying to another person?
بسم الله الرحمن الرحيم
(Fatwa: 210/200/B=3/1438)
Yes, if the husband gives khula to his wife then it is necessary to observe the iddah after khula.
Allah knows Best!
Darul Ifta,
Darul Uloom Deoband