بسم الله الرحمن الرحيم
If someone gives one talaq to his wife in clear words, he can revoke the same within iddah and after iddah he can take her back with new nikah.
(2) If the woman does not marry anywhere else, he will possess only two talaq throughout his life.
(3) This has same ruling as No. 2.
Allah knows Best!
Darul Uloom Deoband