Tahaarat

Q: One does ghusl and goes to sleep. Then one awakes and takes wudhu and puts on his khuffs. Then his wudhu gets broken. Then one finds out that there was a solid substance in the cave of his tooth. Does he only needs to remove it and wash the place? Is his masah still valid i.e. can he take wudhu with making masah over the khuffs?

Q: Is it permissible to talk of worldly or Deeni things during wudhu?

Q: If one is performing wudhu in the bathroom, and there is also a toilet in the same bathroom, then should one recite the duas of wudhu?

Q: When I get up in the morning, I see some little spots on my underwear. I am unable to decide if these are the spots of mani or any other liquid.

But I can give some detail about I experiences related to this problem:

1. I see these spots daily.
2. I feel nothing all night and no wet dream.
3. When I wash my private part, it seems like something oily is applied on the top of it.
4. These spots are white.

​Please tell me if I have to make ghusal daily or just change my underwear after cleaning my private part?

Q: 

1. A person begins fasting in the state of janaabat. Regarding ghusl in this state, is the ghusl valid if the water does not reach the inside of the throat or the inside of the nose (i.e. these actions cannot be exaggerated out of fear of the fast breaking)? Will the ghusl be valid if the water did not reach deep into these areas? Or would the person make ghusl washing the nose and mouth as in wudhu and upon breaking the fast would the person then gargle the throat and wash the inside of the nose properly?
2. A person forgets that they are fasting, and thus gargles and washes the nose intensely so that water is accidentally swallowed. Is the fast broken, bearing in mind that the person forgot that s/he was fasting?

Q:

1. What is the ruling with regards to water in a bath tub. The moment one steps into a bath tub, is the water considered as maaul musta'mal, thus ghusl will not be valid with such water! Is this correct? 
2. Is it true that water should not be able to seep through ones mozas? Is it correct?
3. What is maaul musta'mal?

I would appreciate 5 references to each answer.

Q: Can one recite quraanic aayats of Dua like Aayatal Kursi for protection in the state of haidh or janaabat?

Q: Is it a bidah to make masah of the nape in wudhu?

Q: Is it necessary to remove surma and kaajal from the eyes when taking a ghusl?

Q: In  a country  where esha and fajr time does not exist in certain months like England UK, can a Mazoor person who has made wudhu for maghrib salaah pray esha and fajr with the wudhu which was made for maghrib salaah?