single talaq remarriage iddat

sir 1 can muslim pronounce single talaq and divorce his wife does he need to utter thrice 2 sir is the difference bw talaq ahsan and talaq biddat that former former is single pronouncement later triple 3 can muslim woman claim maintenance after iddat period also 4 if a muslim woman has returned back her iddat amt back to her husband and returned to her home has she waived her right can she claim back again 5 if a husband divorced his wife by uttering single talaq on 12 feb 2016 and divorced and can he remarry again on 25 mar 2016 does he need to wait for completion of iddat of woman then remarry or can he immediately remarry