Performing Salaah on a musalla which was purchased with haraam money or through an invalid transaction

Q:

1. A musalla is purchased with haraam money. Is any Salaah performed on this musalla valid?

2. A musalla is purchased with halaal money, but the transaction was invalid and the seller still remains the Shari' owner. Is any Salaah performed on
this musalla valid?

3. A musalla is purchased by a person with a largely doubtful income. Is Salaah valid on this persons musalla?

A musalla is purchased by a person with a largely doubtful income. He gives this musalla to Zaid as a gift. Zaid knows the largely doubtful nature of
this persons income.

4. Should Zaid perform Salaah on this musalla?

5. Is the Salaah of Zaid valid on this musalla?

6. Is the Salaah of anyone valid on this musalla?

A Muslim woman gives a musalla as a gift to a Ghair Mahram Muslim man. They have a haraam business relationship and are very friendly with each other. This Ghair Mahram Muslim man then keeps this musalla at home which is used by his wife and children on a daily basis. They have been using this musalla for about two years now.

7. Is it correct to perform Salaah, or do any Ibaadah, on this musalla?

8. Are all the Salaah (approx. 2 years) and Ibaadah performed on this musallah by the Ghair Mahram Muslim man and others, primarily his family,
valid?

9. If not, is qadha necessary for these salaah?

10. Is Sajda-Sahw valid on this musalla?

11. If it is necessary to do anything with this musalla, like return it to the woman or give it in charity without the intention of reward, please
advise accordingly.

Doubts regarding impurity

Q: After menses I got discharge and there was blood in it. I went to the washroom and saw it was dry and stuck to my pants I didn't have time to clean
so I left it and decided to clean later on. When I went back the discharge was scraped off and a little was left. It probably got scraped by rubbing from my body and fell off through my pants. I don't know where it fell in the house. If I sweep and wipe the floors will the floors be impure. What do I do?

Commencing a report with Bismillah

Q: Insha Allah, I will soon be submitting a final report for my studies. The document contains an 'Acknowledgements' page, which I would like to begin with the complete English translation of: بسم الله الرحمن الرحيم. However, I am afraid of disrespecting the name of Allah, as I am not sure how the document will be handled. Would it be best not to print Bismillah, or will it be permissible to instead print 'In the name of the Almighty', or something similar? Please could Mufti Saab advise on what/what not to print.

Returning stolen money

Q: I took/stole some money when I was much younger and I am not sure whether I took zakaat or lillah money. Now when I am going to put the money back, what must I write on the envelope (because I'm not sure what money it was).