Classical Music: What did Tzar Alexander I of Russia give to Chopin after a performance ?

Questions

The gear which enables the drive wheels of a car to turn a corner while on the same axle?

Which city does Tempelhof airport serve?

Name of the greek goddess of retribution?

Who starred along side Peter Sellers in The Millionairess?

Which composer did Carl Boehm play in the filmThe Magnificent Rebel?