Qadha Salaah

Q: Is it permissible to read qadha after fajr and after asr salaah?

Q: Someone missed Dhuhr for a valid reason, then without forgetting he did knowingly not make it up but prayed, Asr, Magrib, Isha+Witr, then next days Fajr, Dhuhr, Asr then Maghrib time entered, then he made his missed Dhuhr up. In this situation all the prayers he has prayed (before making the missed Dhuhr up) are they valid? Also what if he prayed Asr, Maghrib then Isha time entered then he prayed the missed Dhuhr. In this situation are Asr and Maghrib valid?

Q: With the Mercy of Allah, I have recently starting reading all my qadhaa salaah that i have missed since i became baaligh, this being a few years of salaah. I am able to read my fajr qadhaa before leaving for work, then my zohr qadhaa after performing zohr salaah, magribh qadhaa after magribh and esha after esha salaah. I have not been able to fit in my asr salaah as I am aware that one cannot perform any salaah afer asr. However, I have been advised, that if i am performing my qadhaa salaah then i can perform it after asr. Is this correct or permissable?

Q: Can a person read any nafl or qaada when tahajud time end before the fajr azaan.

Q: My friends insist that there is qadha for missed Salaah during haidh just like there is qadha for saum. I tried explaining to them that there isn't but all they say is that I am not learned and the learned have told them. Its reached a stage where they are calculating their missed Salaahs and making qadha of it.

Q: Can one perform qadha salaah for the deceased?

Q: If I missed Asr namaaz, and I want to do the qaza at Maghrib time, which one should I do first, Asr or Maghrib Namaaz?