Islamic finance

Q: My mom is kafir and is asking about Islamic finance. I to be honest don't know much about this subject and have heard that it is not actually so Islamic after all. I live in Australia. Please advice on this matter.

Doubts regarding kufr

Q: I know someone who has bad thoughts, that he does not want, but they keep coming back and now he is confused about a particular situation. He had bad thoughts and he did not intend to say anything, but he worries because when he exhaled he thinks he heard part of the bad thoughts come from his mouth or like a motion on the tongue or he said part of it under his breath without wanting to say that. So the question is : If somebody has a thought of kufr and they said part of it or all of it without intending to or wanting to and they are angered by it, does this count as kufr?

Watching television

Q: Is it kufr if I put on a movie where the actor says "Jesus" or "Oh my God"? Because their is a verse in the Quran where Allah says "and if you hear the signs of Allah being mocked at, then do not sit with them or you will be like them" will it be kufr if I put it on and allow other Muslims to watch it?

Removing impurity from electrical switches

Q:

1. If our impure hands touches the electrical switches can we take a tissue wet it and wipe the switches? Will it become pure?

2. If impure hands touches table etc and there are no visible traces of impurity and then I take some tissues wet it with water and clean the table, will it become pure?

3. How many times do we need to wipe a surface with a wet cloth or tissue to make it pure?

Purchasing a grave in advance

Q: Some people reserve a piece of land for their graves in their lives so that after their demise their graves could remain near their passed away relatives. My question is that keeping this thing in mind, is it permissible to do so? If not than is it permissible for any other reason?