No.
Yes
No it doesn't require to be hyphenated.
No, a hyphen is not needed.
The correct spelling of hyphen is nephyh
No, faux pas doesn't require a hyphen.
Yes
No.
Ideally, yes
These are two words. There is no hyphen in the concept. In charge means to have leadership in English, so there is no hyphen to connect the two.
If you're using the phrase as an adjective (example "I hate the end-of-the-year audit!") then it will definitely need the hyphens. Otherwise, the hyphens are incorrect.
Yes. "Hard-working" is a compound adjective, and therefore requires a hyphen between the two words. It is also correct to omit the hyphen and use the single word, "hardworking."
No, they are two separate words.