Tahaarat

Q: Is it mandatory to do wuzu before taking bath (after sex)?

Q: If I find some surma in the corner of my eye and it is like one particle which is smaller than sand, do I have to repeat my wudu? 

Q: I read that the sweat of a kaafir is impure. In the Uk there are lots of shopping centres where the cashiers are non Muslims. If we go to the cashier with our food or clothes and they touch it to scan it are we not allowed to wear those clothes and eat that food?

Q: My question is regarding concrete floor and impurity. I know for a fact that some dry impurity fell on the concrete, so I wiped it once with a dry piece of tissue (and should have left it there). But for some reason I had poured water on it and it went underneath the basin of the bathroom. If I tried my best to soak up the water with tissue, would it be considered clean. Keeping in mind I poured water on it once. I was in a hurry because others needed to use the w/c.

Q: My wife has dyed her hair on my wish. She is advised not to wash her hair for 3 days (she can do masah). How can she do Ghusal if needed? Can she do masah of her head while she washes her whole body during Ghusal?

Q: I had an operation on my left hand. It is currently bandaged up until just below the elbow. Three fingertips (nails) and the entire thumb is exposed. Please explain to me how to do masah, will the thumb and fingertips have to be washed?

Q: I had ejaculation last night and don't have ghusal. I have 3 questions:

1. If I wear clean clothes, do they become impure (naapak) if my body has sweat and my clothes become wet as my body is impure (naapak).

2. If I drink or eat something without ghusl will it be haram?

3. If I prepare food and wash my clothes with water in this condition will both of these things become impure if I dont have ghusal?

Q: I got up and noticed wetness but as I was having this kind of discharge most of the time nowadays and before sleeping there was some discharge, so I didn't do fard ghusl and read fajr and recite Quran. But I was feeling like I was sinning as the amount of discharge was not this much before sleeping and on the other hand it was like normal discharge which I was experiencing normally. Now is my salah valid or not?

Q: Is niyyah for ghusl sunnah?

Q: In Tayammum, is it necessary that the whole palm/hand be able to touch the earth? For example, if someone is sick on a hospital bed, if a small pebble was brought to them, and when they strike this pebble, first with the right hand and then with the left hand, a very small part of the palms touches the pebble... would this taymmum be valid? So actually my questions are:

1. Can the hands strike the "earth" separately (first strike with right and then left), or do both have to strike the earth together?

2. Can tayammum be done with "earth" which is so small that the whole surface area of the palm doesn't cover the "earth".