Qiraat in Salaah

Q: If a person recites a surah in the first rakaat and repeats the same surah in the second rakaat of a nafl Salaah, will it be makrooh?

Q: If a person recites a surah in the first rakaat and repeats the same surah in the second rakaat of a fardh Salaah, will it be makrooh?

Q: If a person recites half of a surah in the first rakaat and recites the second half of the same surah in the second rakaat of a nafl Salaah, will it be makrooh for one to recite in this manner?

Q: If a person recites half of a surah in the first rakaat and recites the second half of the same surah in the second rakaat of a fardh Salaah, will the Salaah be valid?

Q:

1. When reciting surahs in salaah, does one have to t​ake a breath after every verse or can they just pause slightly and go onto next verse.

2. What if they stop and take a breath on a part they should not and carry on reading. Like in Surah Fatiha, I sometimes take a breath just before 'ghair ril maghdoobi alaihim' even though there is no pause there. Is my Salah ok in both cases?

Q: After a sajdah Ayat in salaah, does one recite Bismillah before continuing with the qiraat?

Q: I read that in the 3rd and 4th rakaat of qadha salaah (zuhar, asar, maghrib and esha) you can pray subhaanallah three times instead of Surah faatiha and the Salaah will be valid and you will have fulfilled the right of the Salaah. Is this true?

Q: If one has many years of Qadha salah can one read one ayah per rakah, eg. the starting ayaats of Surah Baqarah, is it sufficient to recite 1 ayah which runs into 1 or 1.5 lines?

Q: When one recites Surah Naas in the first rakaat, what should he recite in the second rakaat?

Q: What is the ruling on reciting inaudibly, is there a consensus on its permissibility? Like without noise and just moving the tongue.