Jamaat Salaah and Imaamat

Q: Can an old man who performs salaah on a chair lead the jamaat salaah in the Musjid?

Q: Two people were performing salaah with jamaat. Thereafter, a second muqtadi joined the jamaat, but the first muqtadi did not move back to stand with him behind the Imaam. In this case, should the Imaam move forward?

Q: Can the imam accept the luqma given by a mahram woman who is praying behind him, if the imam makes mistake in the qiraat. Is the namaz valid or becomes void?

Q:

1. There is a masjid inside a university where many Muslim students live, but it often does not have any jamaat on Sundays, though Friday prayer is held there. An imam is appointed for the masjid, but he often does not come for fajr, isha and prayers on weekends (maybe because he lives far from the university). Is it correct to start a 2nd jamaat after the imam has already led the 1st jamaat in Salaah?

2. Is it correct to offer Friday prayer in this mosque?

3. I led a 2nd jamaat in this masjid, but after I started, I heard someone else leading another jamaat in the corner of the masjid. I did not know this before I started. Will I and my muqtadi's have to repeat the Salaah?

Q: What is the condition of the salaah if the imam makes the following mistakes

1. In takbeer the kaaf is read with a kasra

2. In fatiha, the laam of Alhamdu is read with a fatha

3. In Tasmee the meem of samia is pulled a little

4. In the last Ayah of surah nasr, the word rabb is omitted thus reading: bihamdika

Q: Is it ok to bypass the nearest mosque and go to a distant mosque in order to pray there, because the Imam of the (distant) mosque has good tajweed and tarteel and prays bigger surahs and is well acquainted with the Masail?

Q: I am living in Saudi Arabia and I am a Hanafi. Somebody told me that my prayers behind the Saudi Imams are void because of difference of wuzoo, because of their small beards (not one fist as required), because of the salaah timing, because they are shafi or hambali or wahabi. So they insist that I repeat all my 8 years of prayers. What is the fatwa? 

Q: One day I was leading three people in zuhr prayer. In my second last rakaat I felt like something was coming out from my private part. I still continued with the prayer. After I finished I went to the toilet and I found it was mazi. I came back after I washed myself and made wudhu but the people we prayed together with were gone. I don't know where to find them because it was a market where we prayed. I don't know them at all. I then observed the prayer alone again. So what should I do about them?

Q: What is the ruling regarding praying behind an Imam considering the Imaam shaves his beard and his pants are below his ankles? What should we do in this condition?

Q: In the Holy Mosques of Makkah and Madinah, outside the mosques, there are big verandas (open space). It is seen that the people walk in these verandas with their footwear on.

1. Can we pray on the floor without a prayer mat?

2. Will our salah be valid?