Misc: Who was elected leader of the Liberal Party in 1990?

Questions

Which note does a symphony orchestra tune to?

What is the common name for the fever psittacosis, which is passed on to humans via birds?

Which country does the lion represent on the Queen's coat of arms?

Which planet takes 23 hours, 56 minutes and 4 seconds to revolve once on its axis?

What ingredient in smelling salts produces the dreadful smell?