Ruling on zakaah that is paid to the department of zakaah and income tax

What should he do with the leftover donations?

Can he give zakah to one of those who are working for him?

Can zakaah be given to one who will build a house with it?

Giving zakaah to a female relative if her son is going to take it and spend it on haraam things

Can he give his zakah to his mother through breastfeeding?

Giving zakaah to a poor woman whose husband does not spend on her

Giving zakaah to someone without being certain that he is entitled to it

Can zakaah be given to one who suffers from kidney failure?

He gave his zakaah to a poor man who turned out to be well off