Method of Salaah

Q: I have read somewhere that it is makrooh to pray near impurities. Is it makrooh if one prays in a room that has a toilet attached to it?

Q: I have read somewhere (I think it was Baheshti Zewar) that it is makrooh to pray in a place where one would get distracted. What is meant by being 'distracted' in this ruling?

Q: While performing salaah, if I stand for qiyaam and do ruku in a normal manner, but I sit on a chair and perform my sajdah and jalsah, is my salaah valid? This is not due to any physical ailment.

Q: If a woman is one month pregnant, can she perform salaah on a chair for the safety of the baby?

Q: If during the recitation of Durood-e-Ebrahim, someone mistakenly says "majit" instead of "majid", does it invalidate his prayer?

Q: What is the meaning of khushoo and khuzoo in salaah and how do we attain khushoo and khuzoo?

Q: What is an easy way to acquire concentration in salaah? When I start offering salaah, then mundane affairs and other things come into my  mind and distract me. 

Q: How many times is it prescribed to send blessings to the Holy Prophet Muhammad (sallallahu alaihi wasallam) in a salat and when?

Q: What is the correct way of reciting solatul-ibrahim?

Q: I recite dua in jalsah (sitting between 2 sajdahs) as per hadith "Allahum magfirli warhamni wajburni warfaani wahdini wa aafini warzuqni". I like to add these words to this dua "wa aauzu bika min kulli balaa id-duniya wa azaabil aakhirah".

I would like to know if adding these words in the dua is permissible or not?