yes
Any three...? Tamino, Papageno, and Pamina.
Mozart died in 1791, so the answer is "no."
Wolfgang Amadeus Mozart never copied any pieces. He wrote his own, completely original works.
The only composition of Mozart that contains the harp is the "Concerto in C for flute, harp, and orchestra. I guess any composer should at least know how an instrument works in order to compose for it!
Mozart had one sister
No, he did not.
Mozart's sonatas are actually among the least of his compositions. They are beautiful, but the concertos are more significant as piano music, and among his total output they are not among the most important works by any means.
Mozart wrote every kind of vocal music, from solo arias to large-scale choral works and operas. His earliest instrumental works date from when he was 5 years old. His earliest vocal work of any kind was an aria for tenor and orchestra when he was 9.He also wrote a small number of lieder or songs, most for solo voice and piano. The earliest of these in Ludwig Köchel's chronological catalogue of Mozart's works is Köchel #47e, An die Freude, "To Joy." Mozart wrote this in 1767, when he was 11 years old.
They were always deep and complex, smooth and perfect- but never, EVER betrayed any of Wolfgang's emotions just for the sake of a "fake reaction", as he called it. If he never added his emotions into it, the listeners could feel what they like from his music, so everyone will have a different opinion.
NO
The Vienna Phiharmonic was founded in 1842 and Mozart died in 1791. So if you mean 'Were any of Mozart's symphonies played by the Vienna Phil in his lifetime?' the answer is no. If you mean 'Have any of Mozart's symphonies been played by the Vienna Phil?' the answer is yes, many of them, many times.
He wrote all of his works, yes. He did not write any of the works of Ben Jonson, Oscar Wilde or John Lennon.