Performing qadha salaah in the masjid

Q: I have heard that one should pray Qadha prayer in solitude so that it should not be revealed to anyone that one is praying Qadha prayer. Is this true? 

If so, then there is a problem that in a house where one does not get solitude and it is not possible in the mosque, then what should one do in such a case? 

Then can one pray Qadha prayer in front of the family members or in front of everyone in the mosque.

Missing Jumuah Salaah

Q: If a male misses 3 jumuahs through work purposes but he had clarified it with his boss but had no one else to put in his place, what should he do concerning reading the shahaadat? The boss has promised that he will be getting a replacement.

Hajj for a woman whose husband doesn't have sufficient money to go for hajj

Q: My husband and I would have been accredited for Hajj this year but he asked SAHUC to remove our names before the list came out as he says he cannot afford it and Hajj is not Fardh on him. 

He does own 2 cars but does not have enough disposable cash to pay for the trip. 

Is Hajj fardh on him? I can afford to pay for my own Hajj

Folding one's hands in the last rakaat of the sunnats of fajr while sitting and performing salaah

Q: If sitting down and performing sunnat of Fajr, after the last sajdah of the salah, one puts their hands up again for Surah Fatiha, but remembers before reciting anything, and then goes to continue tashahudd, should a qadha be recited for this salah? And should one have made sajdah sahw in such a case .

Can the Imaam al-Muslimeen compel someone to discharge his zakaat

Q: I would like to inquire: if an individual deliberately refuses to pay Zakaat, does the Imaam al-Muslimeen have the authority to compel him to discharge this obligatory duty? 

I have read that the Fuqaha make a distinction between amwaal-e-zahirah and amwaal-e-batinah. Could you kindly explain this further and provide references from the books of Fiqh?