Salaah

Q: One day I forgot to offer zuhr salaah and remembered it only 20 min before Asar salaah. I performed the zuhr salaah. Will it be considered as qaza or is it done before Asar time?

Q: I set a musalla (prayer mat) on an impure ground. However the ground had no signs of impurity on it. If my feet get off the musalla (prayer mat) and touch the ground during salaah for just a short period of time, will my prayer be valid? No impurity came on my feet and the ground had no signs of impurity.

Q: Is it right to perform sajda-e-sahw if someone forgets to make it within salaah? When I remember, without reciting anything else, I just to sit down and recite attahiyyaat upto (abduhu warasuluh) then one salam on the right side then two sajdahs of sahw and then attahiyyaat, durood and dua and then 2 salaam. 

Q: Sometimes after getting my haidh, my underwear would become stained with blood and I would perform salaah in this manner. I also cannot recall how many salaah was performed like this. Please advise me what to do.

Q:

1. How many saffs (rows) can we cross while in the state of namaaz in order to fill the front saffs (rows)?

2. How much can we move horizontally in the same saff (row) in order to fill the gap?

Q: If a person arrives late for salaah and notices that the saff of the children is going to join up with the sufoof of the adults, should he move the children to the back? 

Q: When I offer namaaz in the masjid, when going into sajdah, many peoples heads touch the feet of the person in the front row. Whats the ruling on it?Does it affect the namaaz in any way?

Q: Is sleeping while azaan is going on haraam?

Q: How should sajdah-e-sahw be performed?

Q: I have a lot of gas when I wake up in the morning for fajr. It is almost an everyday thing. Sometimes the feeling for breaking wind is strong and I pray the fardh prayer first then the sunnah 2 rakahs in case I miss the prayer if I have to break my wudu. Is that valid given my situation of having lots of gas in stomach?