1. If a muslim gave talaq to his wife as per islamic law. The indian court will accept it and she will not be his wife any more.
2. An Ex wife can place false cases against her former husband including the 498a.
3. The muslim divorced wife also can place cases for Mahar, her articles (including gold, money other gifts given by her family during marriage period) and Mata (Fair provision and Maintenance) under section 3 of Muslim woman protection on divorce act.
In No 2. of the above ex wife will accuse the husband and his family for demanding and torturing for dowry.
In No 3 of the above the wife shall demand for a huge amound as mata also huge amount of dowry a lot of gold ornaments and other items which was never given to her husband.
But do not worry most of these case will not prove in the court due to lack of evidences.