Mozart wrote 5 concertos for violin and orchestra. He also wrote two rondos and an adagio for the same forces.
Mozart wrote 5 violin concertos.
He played the violin, viola and clavier, so he played three instruments.
Mozart composed many more concertos for piano than for any other instrument.
Mozart composed for nearly every combination of instruments of that time. Examples are works for: piano and orchestra; orchestra; voice and orchestra; piano; string quartet (2 violins, a viola and a cello), string quintet (2 violins, 2 violas and a cello), piano and violin, clarinet and orchestra, flute and orchestra, and many, many others.
Only considering attested works, the number is 44 with the following distribution: piano (27), violin (5), horn (4), flute (1), bassoon (1), harp and flute (1), oboe (1), clarinet (1) for a total of 41 to which we can add 3 more: 1 sinfonian concertante for violin and viola 1 sinfonia concertante for oboe, clarinet, horn and bassoon 1 flute concerto (arrangement of bassoon concerto)
Mozart performed a great many of his works himself.
Well over 600.
2
Twelve!
Mozart played many instruments including the piano, the violin, the viola, the organ, the harpsichord, the fiddle, and possibly several others including the clarinet and the trumpet.
He wrote 10
A little over 600.