Nikaah breaking through the husband leaving the fold of Islam

Q: My sister married a boy who converted to Islam. Soon after the marriage he again converted to Hinduism. The boy left her and went away without giving her a talaaq. She had not informed her family about the marriage. Her parents got her married to someone else who gave her talaaq within 2 months of their marriage. The Hindu boy then suddenly called her and gave her a talaaq. Can she now get married to someone?

Eating vegetables that are not washed and eating from utensils that are not washed

Q: What is the ruling for the following:

1. If someone cooked veges without washing them (veges might have some dirt like on it) and eatimg them, would this be halal?

2. If someone does not wash the cooking utensils and cooks in this way, would consuming the food prepared in those unwashed utensils be halal?

3. If roti is prepared on a 'tawa' which releases some of its black particles, when roti is heated over it, the black particles stick on the roti, will consuming the roti with those tawa black particles halal?

Ayk Hadith ke suboot ke baare me sawaal

Q: Mera swal yei hai kay hmay school may aik kitaab parhai jati hai jis ka naam sharah sarmaya urdu hai is kitaab mai aik hadeese qudsi likhi hoi hai jo kay yei hai (mai aik chupa huwa khazana tha jab mainay chaha kay mujhay koi jaanay to mainay makhlooq ko paida kr diya)

Mujhay kisi nay kha hai kay yei hadees mauzu yani man gharak hai kya waqai aisi koi hadees hai agar nahi to phir is kitab may jo hadees likhi hai to kya is kay khilaf hmain book auditor ko feedback dena chahyei ta kay is ko nisaab say nikala jaye? 

Scarf coming in one's mouth while fasting

Q: Frequently, when going in sajdah, the fabric of my headscarf or the prayer mat ends up on my lips or in my mouth. This is an issue when I’m fasting. I don’t know if anything like microfibers or small hairs have entered my mouth. Today this happened during salah but I couldn’t feel anything in my mouth after it occurred so I assumed I could swallow as usual.

1. Was this correct?

2. If this happens during salah, and I feel something in my mouth after, do I have to spit?

3. If this happens in salah or near the end of it, do I have to check in a mirror afterwards to see if anything inside my mouth?

Changing one's intention of staying away from sins

Q: I made a niyat a few months ago and now I want to make some changes to it because it is getting difficult to stick to the niyat. I made a niyat like this that "I am making niyat that I will stop committing this sin from today"

My question is, while making niyat I did not take Allah Ta'ala's name, I just said that I am making this niyat and is it still necessary for me to stick to this niyat? I want to stay on this but I just want to make some changes in it.

Omitting Surah Faatihah in the third or fourth rakaat

Q:

1. During the fardh salaah of Zohr, Asr, Maghrib and Isha, can the imam omit Surah Fatiha in the 3rd/4th rakat (when there is time constraints)? Stand for 3 subhanallahs before going in ruku.

2. Also, when one is performing Salah individually can one omit for the same reasons?

3. What is the status of Surah Fatiha in 3rd and 4th rakaat? i.e. Fardh, wajib, mustahab etc.

4. Is there any hadeeth to support?