Conditions for the validity of Salaah

Q: A person commenced his sunnat of Zuhar. Then he realized that the time of Zuhar is about to end so he changed his intention to fardh. Will this intention be valid?

Q: Can and imaam put on a short sleeve jubba to perform salaat in jama'ah?

Q: Can I combine my prayers? I have a urine condition where if I go to the toilet, then after a few minutes, I feel that there is a drop of urine coming out.

Due to this condition, I try to not go to the toilet in the daytime so that I can perform my prayers, but it is a painful process to suppress your need to relieve yourself.

Can I combine my Zohr and Asr prayers and then perform the Esha prayer with Maghrib?

Q: Can we delay isha after midnight? If not, what is the last time to pray isha?

Q: I prayed salah from puberty with proper wudhu but without ghusl for 7 years because I was not aware of the masalah of ghusl. Should I reperform those salahs?

Q: Can a woman only where a scarf whilst performing salaah? The hair is exposed in front?

Q: Is my salah in nike clothes valid?

Q: A woman wears a long dress and a burka while praying Salah. She is however, not wearing a trouser (her dress is long that covers her legs). Is this ok or does she have to wear a trousers also?

Q: After praying Fajr, can we offer nafl or do we have to wait after sunrise?

Q: As the Asr prayer for the Ahnaaf starts after Mithle-Thaani, in Gulf countries it starts at Mithle-Awwal and the jamaat of Asr in the Masjid is made whilst the Dhuhr time of Ahnaaf is still going on and since in each and every part of the Gulf the asr jamaat is at earlier times, what should a person do? Should he join the jamaat or should he pray alone for Asr prayer?