Can a muslim pray for his non-mulsim mother who has passed away?

What is the ruling on eating the food (rice, meat, chicken or cake) that is given to us by a Christian friend that he made for his birthday or for Christmas or the Christian New Year? What is your opinion on congratulating him by saying, "Insha Allaah you will continue to do well this year" so as to avoid saying Kull 'aam wa antum bi khayr (approx. "season's greetings") or "Happy New Year" etc?

What is the ruling on mixing with kaafirs and dealing with them kindly, hoping that they will become Muslim?

A brother of ours has recently become Muslim. During his days of Jaahiliyyah (ignorance – i.e., before he became Muslim), he earned a lot of money by dealing in drugs. He brought this money with him and opened a big bookstore and got married using this money. Recently he has been told that it is not permissible for him to give this money in charity, because Allaah is Good and only accepts that which is good, Our question is, what should he do with this money, and how sound is what he has been told?.

It has become common, of late, for people to recite the Qur'ân in a style that comprises a lot of affected weeping. Their recitation loses its sweetness as a consequence. It is closer to wailing than to a recitation. What do Islamic teachings say about this approach to reciting the Qur'ân?

What should a husband do if he discovers on the wedding night that his wife is not a virgin because she did not bleed?

In our country we have been affected by war and we were expelled from our land 23 years ago. Praise be to Allah, my father and I are settled now and we have a business. We borrowed money in order to settle and start a business, the value of which was 1 million. When we worked out the value of zakaah that we owe on the property and trade goods that we have in our possession, it was estimated to be 7 million, and the trade goods on which zakaah is due are worth 5 or 6 million. 
My questions are: 
1. Are we required to pay zakaah, as we have not paid it all these years because we were not able to pay off the debt of 1 million? Was it correct for us not to pay zakaah?
2. We do not have any cash now, if we are required to pay zakaah. We helped a brother of ours to pay off a debt he owed, so that he could pay off the borrowed amount without paying the interest that had been agreed upon. Is it possible for us to waive this debt and thus pay off the zakaah that we owe?
3. We own some property in the country where the war was, that we took possession of after the war ended, and we are planning to sell this property in order to pay off debts and so that we can buy a house in the place where we live now. Is this property subject to zakaah?.

I wasnt aware that ramadan fasts missed due to menstruation had to be made up before nafl ones and I started keeping some nafl ones so is it possible for me to change the intention of the previous nafl ones I have kept or to change the intention of fast during the day? Because the one I kept today for example I started off with the intention of keeping a nafl fast but can I now change this to the intention of making up the ones I missed in ramadan?

How does participating in Hajj affect the life of a Muslim?

Would u please tell me the proper way for women to sit, when we pray, also can you please differenciate the sitting position, from men.