Various masaail of Salaah

Q: Can my Salaah still be accepted even when I lack concentration?

Q: My question is can a woman read her five daily salaah in her bedroom where sexual relations between husband and wife take place? Is her Salaah accepted? Is it a sin or not? Is it makhrooh or haraam?

Q: A drunk/intoxicated person read salaah. Will it be accepted? Will he get reward?

Q: I am just a bit confused about this question that once I made niyyat of reading four rakaats but I made salam after two rakaats an just as I made salam I remembered so I stood up and completed my other two rakaats. So now was my Salaah accepted or do I have to make Qadha for that Salaah. Please advise.

Q: I would like to know if it is permissible to read Salaah with make-up on?

Q: Can a person pray salaah while wearing their glasses?

Q: While using perfume, will namaz not be accepted? If this is true then what will happen with our past namaz because I use perfume and spray every time and offer prayer in it?

Q:

1. A person in the state of Wudhu drinks some juice/fizzy drink/tea/coffee etc. Is it necessary to gargle the mouth before performing Salaah?
2. A person in the state of Wudhu chews some bubblegum and thereafter spits it out. The taste still lingers in the mouth.Is it  necessary to gargle the mouth before performing Salaah? The bubblegum was chewed in order to remove odour from the mouth.

Q: What is the benefit of moving from one's place after the fardh salaah before the sunnah?

Q: Is there any Hadith that states why there are 2 sajdahs in Namaaz and only one ruku?