Qiraat in Salaah

Q: If Surah Ikhlaas is mistakenly recited in the first Rakaat, what is the best Surah to then recite in the second Rakaat?

Q: In one musjid, the Imam Saheb read in the first rakaat of Fajr Salaah from the middle of Surah Tahreem,

يا أيها الذين آمنوا قوا أنفسكم و اهليكم

till the end of the Surah. Then in the second rakaat he read a different surah. Is there any reason for doing so? Would it not be better to start at the beginning of the Surah, read 2 pages, then in the second rakaat finish off the Surah?

Q: In fardh Salaat, is it appropriate to recite Ayatul Kursi in the first rakaat, and a Surah shorter than Ayatul Kursi in the second rakaat? For example, reciting Ayatul Kursi in the first rakaat, and either Surah Asr or Surah Ikhlaas in the second rakaat.

Q: If I am reading 4 rakaats Sunnah salaah and I read surah Naas in the first rakaat, what must be read in the remaining 3 rakaat?

Q: Is the following makrooh:

1. To read a shorter Surah in the first rakaat and a longer Surah in the second rakaat?

2. To read a Surah in the 1st rakaat and then skip a Surah and read the next Surah in the second rakaat?

3. To recite Surahs in the wrong order in salaah?

Q: I have been told that we cannot pre determine what surahs we going to read before commencing salaah. This came up when I told someone that I have first rakaat surahs, second rakaat surahs & so on, so I do not make a mistake or forget which rakaat I am currently reading.

Q: The first rakah of fajr should be long. Is it for the two rakah sunnah or the fard only?

Q: I would like to know if I can pray these 3 surahs in my tahajud salah; surah waqia, surah mulk and surah sajda because I pray out of salah so I can add them to my tahajud salah.

Q: If a person read Surah Naas in the first rakaat, what should he read in the second rakaat? Is this for nafl and for fard salaat?

Q: If I am offering prayers alone then can I read qirat (reciting Holy Quran) in a loud voice? If there is no person except me.